St Louis to Seattle flights
Routavio compares airline fares from several flight booking sites. The lowest one-way fare it found for St Louis to Seattle is €108 (checked on 26 Oct 2026).
Your next trip, last seen at €108
Lowest observedWhen 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.
One-way fare
- Lowest observed
- €108, departing 19 Nov 2026 (Last checked: 26 Oct 2026)One-way fare · Priced departure days checked in the last 14 days: 16Check live prices for this route
- Non-stop, one way
- €155, departing 5 Nov 2026 (Last checked: 26 Oct 2026)
- Airlines seen
- Alaska Airlines, Southwest Airlines, American Airlines, Delta Air Lines, Frontier Airlines, United Airlines
- Reported fastest flight
- 4h 28m
- Non-stop
- Yes
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
- 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
If the observed fare for this date drops, we will email you. At most one message a day.
Airport to city: straight-line distance
- St. Louis Lambert International Airport (STL) → St Louis, city gazetteer reference point (38.6270, -90.1994): ≈ 20 km.
- King County International Airport - Boeing Field (BFI) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 9 km.
- Seattle–Tacoma International Airport (SEA) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 18 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by days before departure
Lowest fare from St Louis to Seattle by days until departure (8 to 30 days): €108 (checked 26 Oct 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 0 to 7 days | €155 | 5 |
| 8 to 30 days | €108 | 11 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Frequently asked
How much is a flight from St Louis to Seattle?
The lowest fare Routavio has observed is €108, found on 26 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 €108.
Are there direct flights from St Louis to Seattle?
Yes. Published schedules report non-stop flights on this route with Alaska Airlines, Southwest Airlines.
Which airlines fly from St Louis to Seattle?
Routavio has seen these carriers on the route: Alaska Airlines, Southwest Airlines, American Airlines, Delta Air Lines, Frontier Airlines, United Airlines.
How long does the flight from St Louis to Seattle take?
Across the 91 fares Routavio observed, the average journey time is 8h 01m, 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?
58 of the 107 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
How much is a non-stop flight from St Louis to Seattle?
Cheapest non-stop one-way fare: €155, departing 5 Nov 2026 (checked 26 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
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Recently observed fares. Prices may change.