SFO
San Francisco International Airport
Practical guidelines for San Francisco International Airport — security, bags, and connections. Take the full checklist offline in the app.
Security
TSA screening
Security checkpoints serve Terminals 1–3 and International. PreCheck lanes open in most terminals.
customs
International arrivals
International Terminal handles arrivals; Global Entry and Mobile Passport Control available.
Baggage
Baggage
United and Alaska hubs. Bag claim is terminal-specific.
transit
AirTrain
AirTrain links terminals, BART, and rental car center. Walking between some terminals is possible airside.
Check-in
Check-in
Confirm your terminal early — SFO has four. Arrive early for evening international banks.
boarding
Boarding
International gates can be a long walk. Follow FIDS closely.
facilities
Lounges
United Clubs, Centurion Lounge, and Priority Pass options. Strong dining in Terminal 2/3.
local rules
Local rules
California sales tax applies. No indoor smoking.
Fly prepared — on your phone
Full SFO profile, boarding-pass checklist, and AI coach offline.