Frontier AirlinesDepart18:20
Thu, Dec 10STL → SAT
5h 47m · 1 stop
$133one way, per person
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- Cheapest fare
- $133
- Cheapest month
- December
- Direct flights
- Not recently
- Quickest trip
- 5h 47m
Frontier Airlines · Thu, Dec 10
from $133
Usually 1+ stop
1,280 km
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Cheapest month to fly from St Louis to San Antonio
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in December 2026
The lowest fares we've seen for each day, cheapest first.
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Where to stay, what to do and getting around, from our travel partners.
About flights from St Louis to San Antonio
St Louis (STL) and San Antonio (SAT) are about 1,280 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 5h 47m. Over the next few months, one-way fares start from $133, and December 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from St Louis to San Antonio?
The cheapest one-way fare we've seen recently is $133 with Frontier Airlines, departing Thursday, December 10, 2026. Over the coming months, the lowest fare in each month ranges from $133 to $250.
What is the cheapest month to fly from St Louis to San Antonio?
December 2026 currently has the lowest fares, from $133 one way.
Are there direct flights from St Louis to San Antonio?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from St Louis to San Antonio?
The quickest journey we've seen takes about 5h 47m. St Louis and San Antonio are around 1,280 km apart.
Which airlines fly from St Louis to San Antonio?
Recent fares on this route were with Frontier Airlines.
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