San Antonio International SAT: the complete layover guide

SAT is the easy kind of small: two terminals share one building about 8 miles north of downtown, and the two furthest gates are only around 0.4 miles apart.

Terminal A is the bigger half, with 17 gates split between a south concourse (A1 to A7) and a north concourse (A8 to A17), plus three ground boarding gates added when the Terminal A expansion opened in early 2026. It hosts Southwest, Delta, Alaska, Breeze, Frontier and Sun Country, along with the international carriers: Aeromexico, Viva, Volaris and Air Canada. Terminal B is the newer, smaller half with gates in the B1 to B8 range and is home to American Airlines and United, though United splits its operation and uses gates in both terminals. Check your terminal on the day.

Landside, the two terminals connect on both the ticketing and arrivals levels, and the walk between them takes 3 to 5 minutes. Airside is a different story. Each concourse has its own security checkpoint at its entrance and there is no corridor behind security, so moving from an A gate to a B gate means walking out, crossing the building, and joining the queue again. The checkpoints open at 3:30 am and close roughly 30 minutes before the final departure of the day.

For connections that stay within one concourse, SAT is about as gentle as a US airport gets. Gates sit close together, there are no trains or buses to catch, and 45 minutes on a single ticket is normally fine. A connection that switches concourses needs more respect: give it 60 minutes as a floor and 90 to feel relaxed, because you are betting on the security line twice in one day.

The airport is mid transformation. A $1.4 billion Terminal C is under construction, planned to open in 2028, and reporting from February 2026 says the project is on schedule. City council coverage notes the design includes space for a Delta lounge. The longer term plan calls for a consolidated security checkpoint serving all three concourses, which would finally fix the airside split, though the details of that are to be confirmed. Until then, treat the two checkpoints as separate worlds.

You can spend the night at SAT, but the airport is not built for it, and the math usually favors a hotel shuttle.

The building stays open 24 hours, but once the security checkpoints close after the last departure you wait landside, in the ticketing halls or near baggage claim. Most seating across the airport has fixed armrests, so genuine stretch out spots are scarce and the floor becomes the realistic option. The terminal runs cold overnight; bring a layer and earplugs. Checkpoints reopen at 3:30 am, which at least means early flights do not require a heroic wake up.

There is no hotel inside the terminal and no sleep pods anywhere at SAT. The good news is the hotel cluster along Loop 410 starts about a mile from the curb. Embassy Suites San Antonio Airport is roughly 0.9 miles away with a free airport shuttle, and a long row of Marriott, Hilton, Drury and IHG properties within a mile and a half run shuttles too, picking up outside baggage claim.

Our honest call: if your layover runs overnight and exceeds 8 hours, take the shuttle. Airport area rooms here are modest money by big city standards, and an actual bed beats a cold tile floor by more than the fare you save. The full sleep map, including which benches lack armrests, is on the sleeping at SAT page.