San Francisco Airport Security Wait Times & SFO Queue Guide 2026
San Francisco International Airport (SFO/KSFO) security wait times by terminal and checkpoint. Queue estimates for Terminal 1 Harvey Milk, Terminal 2, Terminal 3 and the International Terminal, plus TSA PreCheck and CLEAR eGate pricing, private Covenant Aviation Security screeners, peak hours and the quietest windows at United Airlines’ Pacific hub, which handled 52.3 million passengers in 2024.
San Francisco Airport Security Wait Times Today
The San Francisco Airport security wait time estimates below show the typical SFO queue at each terminal checkpoint for this hour and day of week. San Francisco International Airport (SFO/KSFO) is the primary international gateway for the Bay Area and the main hub for United Airlines, which accounts for roughly 45 percent of all passenger traffic at the airport. Unlike most major US airports, SFO uses a private security contractor, Covenant Aviation Security (CAS), rather than direct TSA employees. The same TSA protocols apply, and TSA PreCheck and CLEAR work identically to any other US airport, but the private model has historically shielded SFO from the disruption seen at other airports during federal government shutdowns. Security wait times at SFO vary by terminal, time of day, day of week and season.
How Long Is Security at San Francisco Airport?
Security wait times at San Francisco International depend significantly on which terminal you use and what time you arrive. SFO operates six security checkpoints across four terminals. During quiet midweek windows from 10:00 to 15:00, most passengers clear a domestic checkpoint in 10 to 20 minutes in the standard lane. During the morning peak from 06:00 to 09:00, driven by United Airlines hub departure banks and early business travel, waits of 25 to 45 minutes are common in the standard lane. The afternoon and early evening peak from 15:00 to 18:00 is a second daily pressure point. Unlike Atlanta or Chicago O’Hare, SFO handles a smaller overall daily passenger volume, which means peak queues are generally shorter in absolute terms, though the airport’s fog-related arrival delays can cause departure banking and create unexpected terminal crowding on affected days.
TSA PreCheck members at SFO typically clear the dedicated PreCheck lane in under 10 minutes at most hours. CLEAR members get the fastest identity verification experience: CLEAR uses biometric kiosks to verify your identity, letting you skip the document check queue and proceed directly to the physical screening area. CLEAR eGates, launched at Terminal 1 Harvey Milk in November 2025, take this a step further with fully automated biometric gates that complete the identity verification step without any staff interaction. SFO was the first airport in California to deploy eGates. PreCheck and CLEAR can be combined for the fastest total experience across all SFO checkpoints.
The AirTrain, SFO’s free automated people mover, connects all four terminals before security and runs every few minutes around the clock. Once past security in the domestic terminals, passengers can walk between Terminal 1, Terminal 2 and Terminal 3 airside. The International Terminal requires its own security checkpoint and is connected by the AirTrain pre-security or by a connecting walkway from the domestic terminal loop. Factor any inter-terminal journey into your pre-flight time, especially if checking bags at one terminal and connecting airside.
San Francisco Airport Security: Private Screening by Covenant Aviation Security
San Francisco International Airport is one of a small number of major US airports that uses a private contractor for passenger screening rather than direct TSA employees. Covenant Aviation Security (CAS) has operated at SFO under the TSA’s Screening Partnership Program since 2004. Every CAS screener follows the same TSA security protocols, prohibited items lists and 3-1-1 liquid rules that apply at TSA-staffed airports, and the operation is monitored continuously by TSA and the airport from a dedicated operations centre. Passengers will notice no difference in the security process itself.
The practical consequence of the private model that matters most for travelers is resilience. When the federal government has entered partial shutdowns in recent years, SFO security operations have continued without interruption, while TSA-staffed airports experienced significant staffing disruptions. Items lost at SFO checkpoints are handled by CAS rather than TSA, with a separate lost and found process through Covenant Aviation Security. TSA PreCheck, CLEAR and all other trusted traveler programs operate identically at SFO as at any other US airport. The CAS contract covers all six checkpoint locations across the four terminals.
San Francisco Airport Security Wait Times by Terminal
Your security checkpoint at SFO is determined by your terminal, which is set by your airline. The four terminal buildings are connected pre-security by the free AirTrain. Domestic terminals (T1, T2, T3) also share airside connections post-security. The International Terminal operates as a separate facility with its own check-in hall and security checkpoints. If in doubt about which terminal your airline uses, check your boarding pass or confirm with your airline before arriving.
Terminal 1 (Harvey Milk Terminal) Security
10 to 20 minutes off-peak on weekdays. During the 06:00 to 09:00 morning peak and the 15:00 to 18:00 afternoon peak, expect 25 to 40 minutes in the standard lane. Southwest Airlines departure banks on Friday and Sunday afternoons are the most congested windows at Terminal 1.
The Harvey Milk Terminal underwent a major renovation that completed in 2019, making it one of the most pleasant domestic terminal environments in the US. Terminal 1 is notable for being the first California airport location to receive CLEAR’s eGates biometric checkpoint system, launched in November 2025. eGates allow enrolled CLEAR members to complete identity verification by scanning their face at an automated kiosk, bypassing the staffed document check lane entirely. The gates are opt-in and CLEAR EnVe Pod kiosks remain available nearby for members who prefer the staffed option. The renovated Terminal 1 building connects airside to Terminal 2, allowing passengers to walk between the two terminals post-security. Southwest Airlines is the second largest carrier at SFO by passenger volume and operates a high-frequency point-to-point network from Terminal 1, making Friday afternoon and Sunday morning windows the most congested for this checkpoint.
Terminal 2 Security
8 to 18 minutes off-peak on weekdays. Terminal 2 is consistently the least congested of the three domestic terminal checkpoints, primarily because it serves two carriers with a more balanced departure schedule than the high-frequency Southwest operation at T1 or the large United hub at T3. During peak periods expect 20 to 35 minutes in the standard lane.
Terminal 2 at SFO is widely regarded as one of the best domestic terminal experiences in the United States, regularly cited for its local San Francisco dining options, thoughtful design and generally calmer atmosphere compared to the busier Terminal 3. Alaska Airlines uses Terminal 2 as its primary SFO base and operates an Alaska Lounge here. American Airlines shares the terminal and flies a mix of transcontinental and connecting routes from Boarding Area D. Terminal 2 connects airside to both Terminal 1 and Terminal 3, giving passengers flexibility to walk to a connection in either direction after clearing security. The single Checkpoint D serves the entire terminal, which contributes to the more manageable queue lengths compared to the larger multi-checkpoint operations at Terminals 1 and 3.
Terminal 3 Security (United Airlines Hub)
12 to 22 minutes off-peak on weekdays. Terminal 3 carries the heaviest volume of the domestic checkpoints due to United Airlines’ approximately 45 percent market share at SFO. Morning hub departure banks from 06:00 to 09:00 and afternoon peaks from 15:00 to 18:00 produce 30 to 50 minute standard lane waits on typical days. Note that the CLEAR lane at Checkpoint F is currently closed due to ongoing Terminal 3 renovation work.
Terminal 3 is United Airlines’ primary facility at SFO and the largest terminal by gate count, with Boarding Areas E and F handling domestic and select regional international routes. United flies to over 111 destinations worldwide from SFO and operates roughly 300 daily flights, making Terminal 3 the highest-volume checkpoint in the airport. United has committed to a significant Terminal 3 investment as part of its ambition to establish SFO as a fortress hub. Ongoing renovation work in parts of the terminal is affecting some checkpoint lane availability, including the temporary closure of the CLEAR lane at Checkpoint F. United Premier status holders (Gold, Platinum, 1K) receive priority check-in desk access and priority boarding, but the TSA PreCheck lane is the same for all enrolled passengers regardless of status. Global Entry is particularly valuable for United passengers at SFO given the volume of transpacific connections; the Global Entry enrollment center is located in the International Terminal near the BART station, accessible pre-security via the AirTrain.
International Terminal Security (Boarding Areas A and G)
8 to 18 minutes off-peak. Concentrated international departure banks in the morning from 08:00 to 11:00 produce queues of 20 to 35 minutes at Checkpoints A and G. Lower overall volume than the domestic terminals but concentrated into specific departure windows, particularly for transpacific routes to Asia and transatlantic services to Europe.
The International Terminal at San Francisco International Airport, opened as a $2.4 billion facility in 2000, handles all international departures and serves as the US Customs and Border Protection arrivals point for all passengers entering the United States through SFO. The terminal is divided into two boarding areas: Boarding Area A for most international carriers and Boarding Area G, which handles primarily United Airlines international departures and serves as the location of the United Polaris Lounge, one of the most acclaimed airline lounges in the US. After clearing security at the International Terminal, passengers proceed through passport control before accessing the departure gates. Allow at least 20 minutes for passport control under normal conditions and up to 40 minutes during busy international departure and arrival overlaps. The International Terminal is the BART rail access point for the airport. The BART station is located directly within the terminal building, connecting to downtown San Francisco in approximately 30 minutes and to Oakland in approximately 40 minutes. The free AirTrain people mover connects the International Terminal to all three domestic terminals in under 10 minutes.
San Francisco Airport Security Peak Hours and Best Times to Fly
The two busiest windows for San Francisco Airport security are 06:00 to 09:00 (United Airlines hub departure banks and early business travel across all terminals) and 15:00 to 18:00 (the afternoon surge). Fridays and Sundays are the most congested single days at SFO. Major Bay Area events including San Francisco Pride, Fleet Week and large technology conferences regularly produce above-average passenger volumes across all terminals. Holiday travel periods generate the worst conditions: Thanksgiving week, the Christmas and New Year period, Memorial Day weekend and Labor Day weekend all push wait times well above the daily average at every checkpoint.
The quietest windows at SFO are 10:00 to 15:00 on weekdays and after 20:00 on any day. A Tuesday or Wednesday midday departure during a non-holiday, non-event period is the most relaxed combination available. Early morning windows from 04:00 to 06:00 are also consistently light. Note that fog-related arrival restrictions, which are a year-round feature at SFO due to the airport’s geography, can produce unexpected departure delays from late afternoon through evening even during otherwise quiet periods, as inbound aircraft pile up and scheduled turnarounds slip. The FAA’s current restrictions on simultaneous parallel runway approaches, in place as of early 2026, have reduced SFO’s hourly arrival capacity further and should be factored into any tight connection plan.
| Time of Day | Typical SFO Domestic Security Wait | Status |
|---|---|---|
| 04:00 to 05:00 | Under 10 min | Quiet |
| 05:00 to 06:00 | 10 to 16 min | Moderate |
| 06:00 to 09:00 | 25 to 45 min (longer on holidays) | Peak |
| 09:00 to 10:00 | 18 to 28 min | Busy |
| 10:00 to 15:00 | 10 to 18 min | Quiet |
| 15:00 to 16:00 | 14 to 22 min | Moderate |
| 16:00 to 18:00 | 22 to 40 min | Busy |
| 18:00 to 20:00 | 14 to 22 min | Moderate |
| 20:00 to 23:00 | 8 to 15 min | Quiet |
| 23:00 to 03:59 | Under 10 min | Quiet |
San Francisco Airport Priority Security: TSA PreCheck and CLEAR eGates
Unlike European airports that sell per-trip priority passes, expedited security at SFO runs entirely through the TSA program system. The two main options are TSA PreCheck and CLEAR, which can be used independently or combined for the fastest total experience. SFO is also the first airport in California to offer CLEAR eGates, a fully automated biometric checkpoint launched at Terminal 1 Harvey Milk in November 2025. There is no separately managed airline priority security lane at SFO beyond these programs. Business class and first class ticket holders who are not enrolled in PreCheck or CLEAR queue in the standard lane.
Recommended Arrival Times at San Francisco International Airport
The standard guidance from SFO and TSA is to arrive at least 2 hours before domestic departures and 3 hours before international departures. At SFO, the 2-hour domestic guideline assumes normal security, bag drop and gate walk times within or between connected domestic terminals. During peak holiday travel periods, add 30 to 45 minutes to both recommendations. If driving to SFO, allow additional time for US-101 or I-280 traffic, which can add 20 to 40 minutes during morning and afternoon commute periods.
When Should I Leave for San Francisco Airport? Calculator
Enter your flight details below to get a recommended time to be inside the terminal at SFO. The calculator factors in the typical SFO security wait at your departure hour, inter-terminal walk or AirTrain time, bag drop time and a safety buffer.
Tips to Beat San Francisco Airport Security Queues
A few practical decisions significantly reduce your time in the SFO security queue regardless of which terminal you are departing from.
- Enroll in TSA PreCheck before your next SFO flight. At $78 for five years it is the most cost-effective security upgrade available at San Francisco Airport. The PreCheck lane at Terminal 3 during the 06:00 to 09:00 peak typically clears in under 10 minutes while the standard lane is running 30 to 50 minutes. Apply at tsaprecheck.com or at the enrollment center in the SFO International Terminal.
- Try CLEAR eGates at Terminal 1 if you fly Southwest, Delta or JetBlue. CLEAR eGates, launched in November 2025, are the only fully automated biometric security gates in California. If you are a CLEAR member departing from Terminal 1 Harvey Milk, the eGates complete the identity verification step in seconds with no staff interaction. They are opt-in and the standard CLEAR kiosks remain available if you prefer them.
- Use BART instead of driving during peak periods. US-101 and I-280 can add 30 to 60 minutes to your journey during morning and afternoon commute windows. BART drops directly at the SFO International Terminal and the free AirTrain connects you to your domestic terminal in minutes. The BART journey from downtown San Francisco is consistently faster than driving when traffic is heavy.
- Check flight status before leaving, particularly from October 2026. Runway 1R is under construction through October 2, 2026 and the FAA’s parallel runway restrictions reduce SFO’s arrival rate significantly. Arriving aircraft delays cascade into departure delays for the same aircraft. Check your airline’s app for real-time flight status in the two hours before your departure.
- Know which checkpoint your terminal uses. Terminal 3 has three checkpoints (E, F1 and F3), but the CLEAR lane at Checkpoint F is temporarily closed during construction. Use Checkpoints E or F1 if you rely on CLEAR at Terminal 3. Checkpoint F3 is available for standard and PreCheck lanes.
- Pack liquids in checked baggage where possible. The 3-1-1 rule still applies at all SFO checkpoints regardless of scanner type. Removing the liquid step entirely speeds up the tray conveyor and reduces the risk of a secondary bag check pulling you out of the queue.
- Use online check-in and mobile boarding passes. Alaska Airlines, Southwest, United and American all support mobile boarding passes via their apps. Self-service bag drop kiosks are available at all major carriers at SFO and can significantly cut landside time before you reach the security queue, particularly during the busy morning bank.
- Factor in inter-terminal time if arriving by AirTrain. The free AirTrain connects all terminals pre-security but runs at ground level and can take 8 to 12 minutes to complete a full terminal loop. If you are connecting between the International Terminal and a domestic terminal, allow at least 10 minutes for the AirTrain journey on top of your other calculations.
- Book Global Entry if you connect internationally at SFO regularly. Global Entry includes TSA PreCheck and speeds up the US Customs and Border Protection process on arrival at the International Terminal. Given SFO’s heavy transpacific traffic, the passport control queue on arrival can be significant without Global Entry during busy international arrival periods.
San Francisco Airport Layout and Terminal Overview
San Francisco International Airport (SFO/KSFO) is the primary international gateway for the Bay Area and the Pacific hub for United Airlines, which accounts for approximately 45 percent of all passenger traffic. SFO handled 52.3 million passengers in 2024, ranking it among the top 15 busiest airports in the United States. The airport is located approximately 14 miles south of downtown San Francisco near Millbrae in San Mateo County and is served by BART with a direct station inside the International Terminal.
The airport is arranged in an oval layout with four terminal buildings. The Domestic Terminal loop consists of Terminal 1 (Harvey Milk Terminal, Boarding Area B), Terminal 2 (Boarding Area D) and Terminal 3 (Boarding Areas E and F), which are connected airside post-security and by the free AirTrain pre-security. The International Terminal, with Boarding Areas A and G, sits at the top of the oval and is connected to the domestic terminals via the AirTrain. BART rail access is provided at the International Terminal station, from which the AirTrain provides connections to all domestic terminals at no additional charge. Runway 1R is under construction from March 30 to October 2, 2026, reducing peak arrival capacity and affecting departure scheduling across all terminals during this period. For the full terminal layout, gate assignments and concourse maps, see our San Francisco Airport map and terminal guide.
San Francisco Airport Security: FAQ
How long is security at San Francisco Airport in 2026?
Security wait times at San Francisco International vary by terminal, checkpoint, time of day and season. SFO operates six checkpoints across four terminals. During off-peak weekday windows from 10:00 to 15:00, most passengers clear a domestic checkpoint in 10 to 20 minutes in the standard lane. During the morning peak from 06:00 to 09:00 and the afternoon peak from 15:00 to 18:00, waits of 25 to 45 minutes are common. TSA PreCheck and CLEAR members typically clear in under 10 minutes at any hour. Major holiday travel periods push all checkpoints significantly above average. The MyTSA app and flysfo.com provide current checkpoint condition guidance.
Who screens passengers at San Francisco Airport security?
San Francisco International Airport security screening is operated by Covenant Aviation Security (CAS), a private contractor, rather than directly by TSA employees. CAS has operated at SFO under the TSA’s Screening Partnership Program since 2004. Screeners follow identical TSA protocols and the same rules apply: the 3-1-1 liquid rule, prohibited items lists and all federal aviation security requirements are enforced exactly as at TSA-staffed airports. TSA PreCheck and CLEAR operate normally at SFO. One consequence of the private contractor model is that SFO security is not affected by federal government shutdowns, which have disrupted operations at TSA-staffed airports in recent years.
What are TSA PreCheck and CLEAR at San Francisco Airport and how do they work?
TSA PreCheck costs $78 for a five-year membership and gives access to dedicated express lanes at all SFO checkpoints where you keep on shoes, belts and light jackets and leave laptops and liquids in your bag. Most PreCheck members clear in under 10 minutes at SFO. CLEAR costs approximately $189 per year with discounts available through Delta SkyMiles and credit card benefits. CLEAR uses biometric identification to verify your identity at a kiosk, letting you skip the document check queue. CLEAR eGates, available at Terminal 1 Harvey Milk since November 2025, are fully automated facial biometric gates that complete identity verification without any staff interaction. The programs can be combined: CLEAR or eGates handle identity verification and PreCheck handles the physical screening. Global Entry includes TSA PreCheck at no additional cost and is recommended for passengers who regularly connect internationally at SFO.
When is San Francisco Airport security busiest?
The two busiest windows at SFO are the morning peak from 06:00 to 09:00 and the afternoon and early evening peak from 15:00 to 18:00. Fridays and Sundays are consistently the most congested single days. Thanksgiving week, Christmas and New Year travel, Memorial Day weekend and Labor Day weekend all generate waits well above the daily average across all checkpoints. Major Bay Area events including San Francisco Pride, Fleet Week and large technology conferences also increase passenger volumes. The quietest windows are 10:00 to 15:00 on weekdays and after 20:00 on any day. Tuesdays and Wednesdays during midday in non-holiday, non-event periods are the most relaxed combination at SFO.
What time should I arrive at San Francisco Airport?
For domestic flights from Terminal 1, 2 or 3, arrive at least 2 hours before departure. This accounts for parking or BART transit, check-in, security and the walk to your gate. For international flights from the International Terminal, arrive at least 3 hours before departure to allow for check-in, security, passport control (20 to 40 minutes during busy periods) and the walk to your gate in Boarding Area A or G. During peak holiday travel periods, add 30 to 45 minutes to both recommendations. TSA PreCheck or CLEAR members can reduce the domestic recommendation to 90 minutes during off-peak periods. If arriving by BART, allow approximately 30 to 35 minutes from downtown San Francisco plus a few minutes on the AirTrain to your domestic terminal.
Are CT scanners in use at San Francisco Airport?
CT scanner technology is being deployed at SFO checkpoints as part of the TSA’s national rollout programme, which has procured nearly 900 units across the US system through 2025 and 2026. CT scanners create a 3D image of bag contents and at equipped lanes allow passengers to leave laptops in their carry-on bag. The TSA 3-1-1 liquid rule remains in effect at all SFO checkpoints: containers must be 3.4 ounces or 100ml or less and fit in a single clear quart-sized resealable bag. TSA PreCheck members are the main exception, as PreCheck permits liquids and laptops to remain in the bag during screening. As of July 2025, SFO no longer requires most passengers to remove their shoes. Follow the instructions of the security officer at your lane, as procedures vary between lanes.
What is the difference between the terminals at San Francisco Airport?
SFO operates four terminal buildings. Terminal 1 (Harvey Milk Terminal) serves Southwest Airlines, Delta Air Lines, JetBlue and Frontier Airlines and is home to CLEAR’s eGates, the first in California. Terminal 2 serves American Airlines and Alaska Airlines and is widely regarded as one of the most pleasant domestic terminals in the US. Terminal 3 serves United Airlines and is the largest terminal by gate count, with Boarding Areas E and F. The International Terminal handles all international departures from Boarding Areas A and G and contains the BART station. All four terminals are connected pre-security by the free AirTrain. Domestic terminals T1, T2 and T3 are also connected airside post-security. The International Terminal has its own check-in hall and security checkpoints and should be treated as a separate operation from the domestic terminals.
Does San Francisco Airport have priority security for business class passengers?
There is no separately managed airline priority security lane at SFO beyond the TSA programme lanes. Business class and first class ticket holders who hold TSA PreCheck membership use the dedicated PreCheck lanes. CLEAR and CLEAR eGates, available to any enrolled passenger, give the fastest identity verification experience regardless of ticket class. United Premier status holders, Alaska Airlines elite members and American Airlines AAdvantage elite members all receive priority check-in desk and boarding benefits at their respective terminals, but security lane access is through the TSA PreCheck lanes shared by all enrolled passengers. Passengers without PreCheck or CLEAR in premium cabins queue in the standard lane regardless of ticket class.