San Francisco International Airport (SFO) has four terminals Terminal 1, Terminal 2, Terminal 3, and the International Terminal. Each terminal serves different airlines, and most are connected by walkways or the free AirTrain, making transfers relatively easy.
Quick Answer: Which Terminal Should You Go to at SFO?
At SFO, Southwest, Frontier, and JetBlue operate from Terminal 1; Alaska and Hawaiian are in Terminal 2; United (Domestic) uses Terminal 3; and all international carriers fly out of the International Terminal. You can easily transfer between them using the free 24/7 AirTrain or post-security pedestrian walkways. Always verify your specific boarding pass before arriving, as airline gate assignments can occasionally change.
If you’re searching for the SFO terminal map, this guide explains which airlines use each terminal, how to get between terminals, walking times, and useful tips to make your airport experience smoother.
SFO Terminal Map at a Glance
| Terminal | Main Airlines |
|---|---|
| Terminal 1 (Harvey Milk Terminal) | Southwest, Frontier, JetBlue, Sun Country, AirTran Charter |
| Terminal 2 | Alaska Airlines, Hawaiian Airlines, Air Canada (select flights) |
| Terminal 3 | United Airlines (Domestic) |
| International Terminal | United International, American Airlines, British Airways, Emirates, Lufthansa, Singapore Airlines, Air France, Qatar Airways, ANA, EVA Air and other international carriers |
Note: Airlines occasionally move gates or terminals. Always check your boarding pass before heading to the airport. Call Flying Getaway at our phone and our travel experts will help you compare airlines, routes, baggage policies, and flight options for your next trip.
SFO Airport Layout Explained
Unlike many large airports, SFO has a simple layout.
The airport consists of:
- Terminal 1
- Terminal 2
- Terminal 3
- International Terminal
Most terminals are connected, allowing passengers to walk between them after security in many cases.
The AirTrain also operates 24 hours a day and connects:
- All terminals
- Parking garages
- Rental car center
- BART station
✈️FlyingTip: If you're connecting between terminals, follow the airport signs before exiting security. Staying inside the secure area can save significant time.
Which Airlines Fly From Each SFO Terminal?
One of the most searched questions is:
Which Terminal Is My Airline At?
Here’s a quick reference.
Terminal 1
Common airlines include:
Terminal 2
You’ll commonly find:
- Alaska Airlines
- Hawaiian Airlines
- Select Air Canada operations
Terminal 3
Terminal 3 is primarily used by:
- United Airlines domestic flights
International Terminal
The International Terminal handles most overseas departures and arrivals, including:
- American Airlines (international services)
- British Airways
- Emirates
- Qatar Airways
- Lufthansa
- Singapore Airlines
- Air France
- ANA
- EVA Air
Always confirm your terminal before departure, as operational changes can occur.
SFO International Terminal Map
The International Terminal is divided into two boarding areas:
| Boarding Area | Airlines |
| Boarding Area A | Most international airlines |
| Boarding Area G | United Airlines international flights and Star Alliance partners |
Passengers connecting between United domestic and international flights can often remain inside the secure area.
Can You Walk Between Terminals at SFO?
Yes.
Most terminals are connected either by pedestrian walkways or post-security corridors.
Approximate walking times are:
| Route | Walking Time |
| Terminal 1 → Terminal 2 | 8–10 minutes |
| Terminal 2 → Terminal 3 | 10–12 minutes |
| Terminal 3 → International Terminal G | 10–15 minutes |
For longer distances, the free AirTrain is the quickest option.
✈️FlyingTip: If you have a short connection, walking is often faster than waiting for the AirTrain between neighboring terminals.
How to Transfer Between Terminals
There are two ways to move around SFO.
Walking
Ideal for nearby terminals and domestic connections.
AirTrain
The free AirTrain runs 24/7 and connects:
- All terminals
- Parking areas
- Rental Car Center
- BART Station
- Airport hotels
No ticket is required.
How Early Should You Arrive at SFO?
Recommended arrival times:
| Flight Type | Arrival Time |
| Domestic Flight | 2 hours before departure |
| International Flight | 3 hours before departure |
During holidays, weekends, and summer travel, consider arriving even earlier.
Facilities Available at SFO
Passengers can enjoy:
- Free Wi-Fi
- Airport lounges
- Restaurants and cafés
- Shopping
- Family restrooms
- Pet relief areas
- Charging stations
- BART train connection
- Rental car facilities
SFO is consistently ranked among the best airports in North America for passenger experience.
Related Guides
Planning your trip? You may also find these guides helpful:
Final Thoughts
Navigating San Francisco International Airport is easier than many travelers expect. Whether you’re flying domestically or internationally, understanding the SFO terminal map before arriving can save time and reduce stress.
Always verify your terminal on your boarding pass, allow enough time for security, and use the free AirTrain or pedestrian walkways to move between terminals efficiently.
Need help booking flights from SFO or finding the best airfare?
📞 Call Flying Getaway at our phone and our travel experts will help you compare airlines, routes, baggage policies, and flight options for your next trip.
Frequently Asked Questions
Which terminal is United Airlines at SFO?
United Airlines primarily operates domestic flights from Terminal 3, while most international United departures use Boarding Area G in the International Terminal.
Which terminal is Southwest Airlines at SFO?
Southwest Airlines operates from Terminal 1 (Harvey Milk Terminal) at San Francisco International Airport.
Can I walk between terminals at SFO?
Yes. Many terminals are connected by pedestrian walkways, allowing passengers to walk between them without leaving the airport. For longer distances, the free AirTrain is available 24 hours a day.
How do I get to the International Terminal at SFO?
You can reach the International Terminal by following airport signs, walking from connected terminals, or using the free AirTrain, which stops at every terminal.
Is the AirTrain free at SFO?
Yes. The SFO AirTrain is completely free and operates 24/7, connecting all terminals, parking garages, the Rental Car Center, and the BART station. Call Flying Getaway at our phone and our travel experts will help you compare airlines, routes, baggage policies, and flight options for your next trip.
How early should I arrive at SFO?
For domestic flights, arrive at least 2 hours before departure. For international flights, 3 hours is recommended, especially during busy travel seasons.
Where can I find the official SFO terminal map?
The latest airport maps and terminal information are available on the official San Francisco International Airport website. Checking the official map before your trip helps ensure you have the most up-to-date terminal and gate information.
Which airlines use the International Terminal at SFO?
The International Terminal serves airlines such as United (international), British Airways, Emirates, Lufthansa, Qatar Airways, Singapore Airlines, Air France, ANA, EVA Air, and several other international carriers. Call Flying Getaway at our phone and our travel experts will help you compare airlines, routes, baggage policies, and flight options for your next trip.
Patrick Walker is the travel brain behind Flying Getaway. With a knack for spotting flight deals and a passion for exploring new skies, he helps travelers fly smarter and save more with every trip.
