What Terminal Is United at SFO? Gates, Map & Connections

I fly SFO most weeks, and the question I get asked more than any other is the simplest one: which terminal is United in? Here’s the honest, no-scrolling answer. Domestic United flies out of Terminal 3. International and long-haul United flies out of the International Terminal’s G Gates. Everything else on this page is about not missing your flight once you know that.

United’s Terminal at SFO: The One-Line Answer

If you’re on a domestic United flight — anything within the U.S. — you want United’s domestic gates in Terminal 3, Boarding Areas E and F. If you’re flying United to Asia, Europe, Australia, or most other international destinations, you leave from the International Terminal’s G Gates. That single split explains ninety percent of the confusion, because United’s own check-in and construction pages bury it three scrolls down.

The good news for connections: those two buildings are joined airside, so a domestic-to-international transfer usually doesn’t mean starting over at security. More on that below.

Terminal 3: United’s Domestic Hub (Boarding Areas E & F)

Terminal 3 is United’s house. It has two concourses: Boarding Area E, with 13 gates (E1 through E13), and Boarding Area F, with 23 gates. Mainline United — the full-size jets — uses both E and F. United Express, the regional feeder flights, uses the F Gates only, per Going’s SFO guide. So if your connecting flight is a smaller regional aircraft, expect to be down in F.

It’s worth understanding why T3 feels so busy: SFO is one of United’s biggest hubs and its primary transpacific gateway, and roughly 40% of all flight operations at the airport are United’s. That’s a lot of airplanes funneling through one domestic terminal — which is exactly why the airport is spending billions to rebuild it.

International Terminal, Boarding Area G: United’s Long-Haul Gates

Every long-haul and international United departure leaves from the International Terminal’s Boarding Area G. Here’s the part most guides skip: you don’t have to leave security to get between Terminal 3 and the G Gates. According to Air New Zealand’s SFO connection guide, a secure airside walkway links the two, entering near Terminal 3’s Gate 75 and coming out near International Terminal Gate G92. If you land domestically in T3 and connect to an international United flight from the A or G gates, you can typically stay inside the secure area the whole way — as long as you don’t have to collect checked bags, per Upgraded Points’ terminal guide.

That airside link is the single most useful fact for a connecting passenger, and it’s why a T3-to-international connection at SFO is far less stressful than the map makes it look.

Construction Alert: What’s Changed at Terminal 3 Through 2027

This is the part no other page explains clearly, and it’s the part most likely to trip you up right now.

Terminal 3 is in the middle of the Terminal 3 West Modernization, a $2.1 billion, 927,000-square-foot rebuild, according to Turner Construction. It’s upgrading four domestic gates into flexible international/domestic “swing” gates, gutting and renovating Boarding Area F’s interior, consolidating baggage handling, adding a new sterile connector over to Boarding Area G, and replacing Terminal 3’s entire façade. The work is expected to run through 2027, based on the reopening dates given for the Terminal 3 AirTrain station and the terminal’s Centurion Lounge below.

While that work happens, three things have changed that affect you today:

• Check-in has partly moved. Per the SFMTA’s November 2025 landside notice, the rebuild closed half of Terminal 3’s departures level and cut check-in counters, so United opened extra check-in capacity in Terminal 2. Passengers using the D and E gates should be dropped at Terminal 2; F-gate passengers still check in at Terminal 3.
• The Terminal 3 AirTrain station is closed. An April 2026 SFO alert confirms the T3 AirTrain stop is shut until a new station opens in 2027. Plan to walk, or ride to an adjacent terminal’s stop.
• The T3 departures curb is closed. Roughly Doors 6 through 13 on the departures level are shut. For pickups, the least-congested spot is nearer Doors 10 to 12.

Connecting Between United’s Gates: Real Walk and AirTrain Times

Forget the AirTrain for short hops. A KQED reporter timed the terminal walks in December 2025 and found Terminal 1 to Terminal 2 takes about 3 minutes, Terminal 2 to Terminal 3 about 2 minutes, and Terminal 3 to the International Terminal’s G Gates about 6 minutes — the longest stretch in the loop. If you’re moving between T2 and T3, walking beats waiting for anything on wheels.

The AirTrain earns its keep for the longer legs and for anyone with bags or mobility needs. SFO’s AirTrain is free, runs 24 hours a day, and a train comes every 4 minutes, per Going. The Red Line loops clockwise through every terminal, the garages, the BART station, and the Grand Hyatt; a full loop is about 10 minutes, and an adjacent-terminal hop runs around 5. My rule: walk T2-to-T3, ride the AirTrain for anything further or whenever you’re hauling luggage. If your connection also involves getting to and from SFO — say a BART transfer — the Red Line is your link.

Minimum Connection Times for United at SFO

United publishes its own minimum connection times (MCT) at SFO — the shortest legal gap it will sell you between flights. Flyers track them on FlyerTalk:

Connection type	United MCT at SFO
Domestic to domestic	40 minutes
Domestic to international	45–50 minutes
International to domestic	1 hour 20 minutes
International to international	1 hour 10 minutes

Treat these as legal minimums, not comfortable ones. A 40-minute domestic connection assumes your inbound is on time and your next gate is close — and with the T3 walk to the G Gates running a real 6 minutes on top of any security or customs steps, I’d want more cushion than the table promises. If you’re booking the itinerary yourself, buy the buffer.

If you’re connecting from an international arrival

Where you’re arriving from changes everything. If you land from Canada or Ireland, you cleared U.S. customs before takeoff (preclearance), so your checked bags transfer automatically to your onward flight when you’re on one ticket, per Upgraded Points. Arriving from anywhere else, you have to clear customs at SFO, collect your checked bags, recheck them at the transfer counter, and pass back through security. That’s the real reason the international-to-domestic MCT is 1 hour 20 minutes and not 40 — budget the full time, not the minimum.

United Lounges at SFO: Where to Find Them

If you have lounge access, here’s where the doors actually are:

• Terminal 3: a United Club near Gate E2, and a second United Club in the F Gates rotunda.
• International Terminal, Boarding Area G: United’s Polaris Lounge near Gate G1 on Level 3 (open 6:30 a.m. to 10:30 p.m.), plus a United Club between Gates G6 and G9 on Level 3 (6:30 a.m. to 1 a.m.), per Going.

One construction note for Amex cardholders: the American Express Centurion Lounge in Terminal 3 is closed until 2027, with a temporary Centurion Lounge operating in Terminal 2 near Gate D12, according to Upgraded Points. If you were counting on the T3 Centurion, it’s now a T2 detour.

Where to Check In and Get Dropped Off Right Now

This is the single most out-of-date fact on every other page, so here it is current:

• Flying from the D or E gates? Get dropped at Terminal 2 — that’s where United’s overflow check-in moved during construction.
• Flying from the F gates? Check in at Terminal 3 as usual, but know that the standard T3 departures curb (roughly Doors 6–13) is closed for construction. There’s no clean one-door substitute for departures drop-off right now, so follow the live curbside signage and any staff redirection when you pull up — the usual spots aren’t where they were.
• Not sure which gates? Check your boarding pass, or skim all four SFO terminals before you leave for the airport — with T3 half-rebuilt, guessing at the curb costs you time you don’t have.

FAQ

What terminal is United international at SFO?

United’s international and long-haul flights leave from the International Terminal, Boarding Area G (the G Gates).

Can you walk between United’s terminals at SFO without leaving security?

Yes. A secure airside walkway connects Terminal 3 (near Gate 75) to the International Terminal (near Gate G92), so airside connections between United’s domestic and international gates don’t require re-clearing security. That only works if you’re staying airside; if you’ve already exited to the check-in level, you’ll use the AirTrain or the curb to move between buildings.

Is the SFO AirTrain still stopping at Terminal 3?

No. The Terminal 3 AirTrain station is closed until a new facility opens in 2027. Until then, walk to Terminal 3 — it’s about 2 minutes from Terminal 2 — or ride the AirTrain to an adjacent terminal’s station and walk from there.