Frontier AirlinesDepart20:20
Sun, Nov 8SAN → STL
4h 51m · 1 stop
$219one way, per person
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- Cheapest fare
- $219
- Cheapest month
- November
- Direct flights
- Not recently
- Quickest trip
- 4h 51m
Frontier Airlines · Sun, Nov 8
from $219
Usually 1+ stop
2,510 km
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Cheapest month to fly from San Diego to St Louis
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in November 2026
The lowest fares we've seen for each day, cheapest first.
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About flights from San Diego to St Louis
San Diego (SAN) and St Louis (STL) are about 2,510 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 4h 51m. Over the next few months, one-way fares start from $219, and November 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 San Diego to St Louis?
The cheapest one-way fare we've seen recently is $219 with Frontier Airlines, departing Sunday, November 8, 2026.
What is the cheapest month to fly from San Diego to St Louis?
November 2026 currently has the lowest fares, from $219 one way.
Are there direct flights from San Diego to St Louis?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from San Diego to St Louis?
The quickest journey we've seen takes about 4h 51m. San Diego and St Louis are around 2,510 km apart.
Which airlines fly from San Diego to St Louis?
Recent fares on this route were with Frontier Airlines.
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