Your next trip, last seen at €87
Lowest observedAlaska Airlines · Non-stop · One wayWhen to fly
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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
Short answer
We have seen Alaska Airlines fares from St Louis to Seattle, non-stop. The lowest fare our own searches returned is €87, seen on 2 Oct 2026. The average across the fares we caught is €174. November 2026 is the cheapest month in our observations, at €87. These are prices our searches returned on the dates shown, not quotes; run a live search for today's fare.
Short answer
We have seen Alaska Airlines fares from St Louis to Seattle, non-stop. The lowest fare our own searches returned is €87, seen on 2 Oct 2026. The average across the fares we caught is €174. November 2026 is the cheapest month in our observations, at €87. These are prices our searches returned on the dates shown, not quotes; run a live search for today's fare.
About this route
Explore the fares we observed from St Louis to Seattle. Prices move often, so pick your dates to see the latest options.
- Route distance
- 2,768 km
- Reported fastest flight
- 4h 28m
- Airlines seen
- Alaska Airlines, Southwest Airlines, American Airlines, Delta Air Lines, Frontier Airlines, United Airlines
- Alternative airports
- SUS, BFI
Route-level information; individual journeys vary.
Published schedules report non-stop service with Alaska Airlines, Southwest Airlines. Check current timetables.
A clearer picture of your fare
Frequently asked
How much is a flight from St Louis to Seattle?
The lowest fare we have observed is €87, found on 2 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from St Louis to Seattle?
In our observations November 2026 is the cheapest month so far, at €87.
Are there direct flights from St Louis to Seattle?
Yes. We have seen non-stop flights on this route, flown by Alaska Airlines, Southwest Airlines.
Which airlines fly from St Louis to Seattle?
These are the carriers we have seen on the route: Alaska Airlines, Southwest Airlines.
How long does the flight from St Louis to Seattle take?
The average journey time across the 91 fares we observed is 9h 36m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed St Louis to Seattle fares were non-stop?
61 of the 91 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
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Recently observed fares. Prices may change.
Last checked: 9 Oct 2026