Allegiant AirDepart19:20
Sun, Nov 22EYW → STL
5h 05m · 2 stops
$139one way, per person
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- Cheapest fare
- $139
- Cheapest month
- November
- Direct flights
- Not recently
- Quickest trip
- 5h 05m
Allegiant Air · Sun, Nov 22
from $139
Usually 1+ stop
1,750 km
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Cheapest month to fly from Key West 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 Key West to St Louis
Key West (EYW) and St Louis (STL) are about 1,750 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 05m. Over the next few months, one-way fares start from $139, 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 Key West to St Louis?
The cheapest one-way fare we've seen recently is $139 with Allegiant Air, departing Sunday, November 22, 2026.
What is the cheapest month to fly from Key West to St Louis?
November 2026 currently has the lowest fares, from $139 one way.
Are there direct flights from Key West to St Louis?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from Key West to St Louis?
The quickest journey we've seen takes about 5h 05m. Key West and St Louis are around 1,750 km apart.
Which airlines fly from Key West to St Louis?
Recent fares on this route were with Allegiant Air.
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