
San Francisco International Airport (SFO) offers a free, automated AirTrain service that operates 24 hours a day, with departures as frequent as every four minutes. The AirTrain is wheelchair accessible and has designated spaces for wheelchair users. The Red Line travels in a clockwise loop, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO. The Blue Line travels in a counterclockwise loop, connecting the Rental Car Center, long-term parking, all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO. It's important to note that the AirTrain is located outside the secure area of each terminal, so passengers must exit and re-enter through security when using it to travel between terminals. Now, let's delve further into the specific locations where you can board the AirTrain at SFO International Airport.
| Characteristics | Values |
|---|---|
| Service | Year-round, 24 hours a day |
| Frequency | Departures as frequent as every four minutes |
| Accessibility | Wheelchair accessible with designated space at each end of AirTrain cars; elevator service available at all stations |
| Lines | Red Line (clockwise loop), Blue Line (counterclockwise loop) |
| Red Line Connections | All terminals, terminal garages, the BART Station, the Grand Hyatt at SFO |
| Blue Line Connections | Long-Term Parking, the Rental Car Center, all terminals, terminal garages, the BART Station, the Grand Hyatt at SFO |
| Travel Time | Red Line: 9 minutes for the entire loop; Blue Line: 25 minutes for the entire loop |
| Restrictions | No eating, drinking, or smoking allowed; service animals and animals being shipped are permitted but animals being shipped must be crated at all times; bicycles are allowed |
| Location | Outside of the sterile area of each terminal, meaning passengers must exit and re-enter through a security checkpoint when travelling between terminals |
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What You'll Learn
- The AirTrain is wheelchair accessible, with designated space at each end of the cars
- The Red Line travels clockwise, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt
- The Blue Line travels counterclockwise, connecting the Rental Car Center, Long-Term Parking, and the BART Station
- Eating, drinking, and smoking are not allowed on the AirTrain
- The AirTrain operates outside of the sterile area of each terminal, so passengers must exit and re-enter through a security checkpoint when travelling between terminals

The AirTrain is wheelchair accessible, with designated space at each end of the cars
San Francisco International Airport's AirTrain service is wheelchair accessible, with designated space at each end of the cars. Elevator service is available at all AirTrain stations. The AirTrain operates 24 hours a day, with departures as frequent as every four minutes.
There are two AirTrain lines at SFO: the Red Line and the Blue Line. The Red Line travels in a clockwise loop, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO. The Blue Line travels in a counterclockwise loop, connecting Long-Term Parking, the Rental Car Centre, all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO. Please note that you cannot reach the Rental Car Centre or Long-Term Parking via the Red Line.
To access the AirTrain from the International Terminal Main Hall, go to the stations near the A and G Gates. You can reach these stations by taking the elevator or escalator to Level 4. From the Domestic Parking Garage, the AirTrain Stations are located at Zones B, D, and F. Take the elevator or stairs to Level 5. From International Garages A and G, take the elevator or stairs to Level 7.
Passengers requiring wheelchair assistance are encouraged to notify their airline of their needs in advance. Upon arrival at the airport, travellers with wheelchairs or other special service requests should approach an airline representative at the ticketing counter for assistance. At Domestic Terminals 1, 2, and 3, skycaps and/or airline staff are available at curbside and check-in areas. At the International Terminal, passengers should proceed to their airline's assigned counter or use specially marked phones at all terminal entry doors to dial 9.1.415.310.4434.
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The Red Line travels clockwise, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt
The AirTrain at San Francisco International Airport (SFO) operates 24 hours a day, with station departures as frequent as every four minutes. It is a free, wheelchair-accessible service.
The AirTrain operates on two lines: the Red Line and the Blue Line. The Red Line travels in a clockwise loop around the central terminal area, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt. The entire loop takes about nine minutes to complete.
The Red Line provides easy connections to the airport's facilities. From Harvey Milk Terminal 1 or Terminal 2, passengers can take the elevator or escalator to Mezzanine - Level 3 and walk across the passenger skybridge. For those arriving by BART, the Red Line connects to Terminals 1, 2, or 3 for domestic flights. The International Terminal check-in counters are a short walk from the BART station's main entrance.
The Red Line also offers convenient access to the Grand Hyatt at SFO, a hotel located within the airport premises. A dedicated $15 million infill station was constructed to serve the Grand Hyatt, which opened in October 2019.
It is important to note that the AirTrain is located outside of the sterile area of each terminal. This means that passengers must exit and re-enter through a security checkpoint when using the AirTrain to travel between terminals.
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The Blue Line travels counterclockwise, connecting the Rental Car Center, Long-Term Parking, and the BART Station
The AirTrain at San Francisco International Airport (SFO) operates on two lines: the Red Line and the Blue Line. The Blue Line travels in a counterclockwise loop, connecting the Rental Car Center, Long-Term Parking, and the BART Station.
The Blue Line serves as a convenient mode of transportation for passengers who need to access the rental car facilities or long-term parking at SFO. It is important to note that the Rental Car Center is exclusively accessible via the AirTrain's Blue Line; the Red Line does not serve this area.
The entire Blue Line loop, which also includes all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO, takes approximately 25 minutes to complete. This line operates in a counterclockwise direction, serving the same stations as the Red Line but in reverse order. Additionally, the Blue Line extends to West Field Road and the long-term parking area.
The AirTrain system provides year-round service 24 hours a day, with departures as frequent as every four minutes. It is wheelchair accessible, and elevator service is available at all AirTrain stations. Passengers should be aware that routine maintenance is conducted on the AirTrain system between 11 pm and 5 am each night, which may result in extended travel times during those hours.
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Eating, drinking, and smoking are not allowed on the AirTrain
San Francisco International Airport (SFO) has a 24/7 AirTrain service with departures as frequent as every four minutes. The AirTrain is wheelchair accessible, with designated spaces for wheelchairs at each end of the AirTrain cars, and elevators available at all stations.
The Red Line travels in a clockwise loop, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO. The Blue Line travels in a counter-clockwise loop, connecting the Rental Car Center, Long-Term Parking, all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO.
Passengers can board the AirTrain from various stations located throughout the airport. From Harvey Milk Terminal 1 or Terminal 2, take the elevator or escalator to Mezzanine - Level 3 and walk across the passenger skybridge. From Terminal 3, follow the signage to the alternate path, as the pedestrian bridge and Garage F pedestrian tunnel to the Terminal 3 AirTrain Station are closed. For United passengers departing from Terminal 2 or 3 and arriving by AirTrain, if you do not have any bags to check, get off at the Terminal 2 AirTrain Station, cross the bridge, and use the T2 Checkpoint. If you are checking bags, get off at the Terminal 3 AirTrain Station, go down one level, enter the parking garage, take the elevators to Level 1, and follow the walking paths to either the E or F/G walkways for Premier or Economy check-in areas.
From the International Terminal Main Hall, access the AirTrain stations near the A and G Gates by taking the elevator or escalator to Level 4. From the Domestic Parking Garage, the AirTrain Stations are located at Zones B, D, and F. Take the elevator or stairs to Level 5. From International Garages A and G, take the elevator or stairs to Level 7.
Please note that eating, drinking, and smoking are not allowed on the AirTrain. However, there are designated smoking areas located across SFO Terminal 3.
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The AirTrain operates outside of the sterile area of each terminal, so passengers must exit and re-enter through a security checkpoint when travelling between terminals
The AirTrain at San Francisco International Airport (SFO) is a free, fully automated service that operates outside of the sterile area of each terminal. This means that when travelling between terminals, passengers must exit and re-enter through a security checkpoint.
The AirTrain operates 24 hours a day, with departures as frequent as every four minutes. The two lines, the Red Line and the Blue Line, cover a total of three miles. The Red Line travels in a clockwise loop around the central terminal area, connecting all terminals, terminal garages, the BART Station and the Grand Hyatt at SFO. The Blue Line travels in a counterclockwise loop, serving the same stations in reverse order, and also proceeding to Westfield Road, the Rental Car Centre, and long-term parking. The entire Red Line loop takes about nine minutes to complete, while the Blue Line loop takes about 25 minutes.
If you are arriving at the International Terminal, you can turn right when leaving customs and take the escalator up to the departures level. From here, walk straight, turn left at the art exhibit, and you will see the station entrance. To get to the AirTrain from Harvey Milk Terminal 1 or Terminal 2, take the elevator or escalator to Mezzanine - Level 3 and walk across the passenger skybridge. From Terminal 3, follow the signage to the alternate path, as the pedestrian bridge and Garage F pedestrian tunnel are closed.
Please note that eating, drinking, and smoking are not allowed on the AirTrain. Animals that are shipped must be crated, while service animals are permitted. Bicycles are also allowed on the AirTrain.
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Frequently asked questions
You can board the AirTrain from any of the terminals at SFO International Airport. The AirTrain station at Terminal 3 is accessible via a pedestrian bridge and Garage F pedestrian tunnel. The AirTrain stations near the A and G Gates can be reached by taking the elevator or escalator to Level 4 from the International Terminal Main Hall.
The AirTrain at SFO International Airport has two lines—Red and Blue—that cover a total of three miles. The Red Line travels in a clockwise loop around the central terminal area, connecting all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO. The Blue Line travels in a counterclockwise loop, connecting Long-Term Parking, the Rental Car Center, all terminals, terminal garages, the BART Station, and the Grand Hyatt at SFO.
The AirTrain operates 24 hours a day with departures as frequent as every four minutes.
No, there is no eating or drinking allowed on the AirTrain.





