SFOSan Francisco·San Francisco International·San Francisco, United States
Recommended minimum1 hour
Concourses
4
Terminal 1 (Harvey Milk Terminal), Terminal 2, Terminal 3, International Terminal (Boarding Areas A & G)
Max Transit
30m
via AirTrain
Avg. Security
20m
~10m with PreCheck
Primary Hub
United Airlines
Domestic → Domestic
60min
Domestic → International
75min
International → Domestic
60min
International → International
90min
AD PLACEMENT — CONTEXTUAL
The AirTrain Red and Blue lines circle the terminal complex on an elevated guideway, with each hop taking about 5-8 minutes plus waiting time. Most domestic-to-domestic connections require leaving the secure area, riding the AirTrain, and clearing TSA security again in the new terminal, while many international arrivals can connect to United domestic flights via a sterile corridor without re-clearing security.
12a6a12p6p12a
Low risk
Moderate
High risk
United mega-hub
Sterile international-to-domestic corridor
AirTrain-linked terminals
Re-screening common for domestic transfers
United Airlines
Is 30 minutes enough for a layover at SFO?

Too tight unless staying within the same boarding area with no security re-clear. See full 30 min guide →

Is 45 minutes enough for a layover at SFO?

Workable only if both flights are in the same terminal and no security re-screening is needed. See full 45 min guide →

Is 1 hour enough for a layover at SFO?

Meets SFO's standard domestic-domestic minimum connect time under normal conditions. See full 1 hr guide →

Is 1 hour 15 min enough for a layover at SFO?

Comfortable for domestic-international connections including AirTrain transfer and security. See full 1¼ hr guide →

Is 1½ hours enough for a layover at SFO?

Solid buffer for most terminal changes and standard security wait times. See full 1½ hr guide →

Is 2 hours enough for a layover at SFO?

Very comfortable, covers peak security delays and slow AirTrain waits. See full 2 hr guide →

Is 2½ hours enough for a layover at SFO?

Generous buffer well beyond any realistic SFO connection scenario. See full 2½ hr guide →

Is 3 hours enough for a layover at SFO?

More than enough time to relax, eat, or shop between flights. See full 3 hr guide →

Is 4 hours enough for a layover at SFO?

Excess time; consider lounge access or a quick BART trip into the city if truly needed. See full 4 hr guide →

AD PLACEMENT — BEFORE FOOTER