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Cheap Flights from St Louis (STL) to Seattle (SEAA)

Compare St Louis to Seattle flight deals

Find the cheapest month or even day of the year to fly to Seattle

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Flight deals from St Louis to Seattle

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Seattle? If you want to travel next month, return fares start from $262. Find the lowest prices on one-way and return tickets right here.
Seattle.$262 per passenger.Departing Mon, 4 May, returning Thu, 7 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 4 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Thu, 7 May, arriving in St Louis.Price includes taxes and charges.From $262, select.
Seattle.$325 per passenger.Departing Fri, 12 Jun, returning Tue, 16 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 12 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Tue, 16 Jun, arriving in St Louis.Price includes taxes and charges.From $325, select.
Seattle.$330 per passenger.Departing Mon, 1 Jun, returning Wed, 29 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 1 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Wed, 29 Jul, arriving in St Louis.Price includes taxes and charges.From $330, select.
Seattle.$352 per passenger.Departing Thu, 26 Nov, returning Tue, 1 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 26 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Tue, 1 Dec, arriving in St Louis.Price includes taxes and charges.From $352, select.
Seattle.$353 per passenger.Departing Mon, 13 Jul, returning Fri, 17 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 13 Jul, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Fri, 17 Jul, arriving in St Louis.Price includes taxes and charges.From $353, select.
Seattle.$353 per passenger.Departing Tue, 26 May, returning Tue, 2 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 26 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Tue, 2 Jun, arriving in St Louis.Price includes taxes and charges.From $353, select.
Seattle.$355 per passenger.Departing Thu, 30 Apr, returning Sun, 3 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 30 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Sun, 3 May, arriving in St Louis.Price includes taxes and charges.From $355, select.
Seattle.$355 per passenger.Departing Thu, 13 Aug, returning Sat, 22 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 13 Aug, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Sat, 22 Aug, arriving in St Louis.Price includes taxes and charges.From $355, select.
Seattle.$357 per passenger.Departing Thu, 5 Nov, returning Tue, 10 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 5 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Tue, 10 Nov, arriving in St Louis.Price includes taxes and charges.From $357, select.
Seattle.$357 per passenger.Departing Tue, 28 Apr, returning Tue, 28 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from St Louis on Tue, 28 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Tue, 28 Apr, arriving in St Louis.Price includes taxes and charges.From $357, select.
Seattle.$357 per passenger.Departing Sat, 19 Sep, returning Mon, 21 Sep.Return flight with United.Outbound indirect flight with United, departs from St Louis on Sat, 19 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Mon, 21 Sep, arriving in St Louis.Price includes taxes and charges.From $357, select.
Seattle.$382 per passenger.Departing Sat, 25 Jul, returning Sat, 1 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 25 Jul, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Sat, 1 Aug, arriving in St Louis.Price includes taxes and charges.From $382, select.
Seattle.$449 per passenger.Departing Sat, 22 Aug, returning Thu, 3 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Sat, 22 Aug, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Thu, 3 Sep, arriving in St Louis.Price includes taxes and charges.From $449, select.
Seattle.$452 per passenger.Departing Sun, 21 Jun, returning Sat, 26 Sep.Return flight with United.Outbound indirect flight with United, departs from St Louis on Sun, 21 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Sat, 26 Sep, arriving in St Louis.Price includes taxes and charges.From $452, select.
Seattle.$558 per passenger.Departing Thu, 21 May, returning Thu, 28 May.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Thu, 21 May, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Thu, 28 May, arriving in St Louis.Price includes taxes and charges.From $558, select.
Seattle.$694 per passenger.Departing Fri, 5 Jun, returning Sun, 7 Jun.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from St Louis on Fri, 5 Jun, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Sun, 7 Jun, arriving in St Louis.Price includes taxes and charges.From $694, select.

Find the cheapest month to fly from St Louis to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Seattle flights are currently cheapest in May.
Apr
from $357
May
from $262
Jun
from $325
Jul
from $353
Aug
from $355
Sep
from $357
Oct
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Nov
from $357
Dec
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Jan
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Feb
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Mar
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Direct flights from St Louis to Seattle

Alternative St Louis to Seattle routes

Looking for the cheapest, fastest or easiest route from St Louis to Seattle? You could fly into the following airports instead.

Seattle Lake Union SPB

2km from central Seattle
Closest
Search flights

Seattle Boeing Fld

11km from central Seattle
Search flights

Seattle / Tacoma International

20km from central Seattle
Cheapest
from $262
Search flights

Paine Field

33km from central Seattle
from $660
Search flights

St Louis to Seattle: Flight information

The things to know before you go.
Cheapest flight found$121
Cheapest month to flyMay
Average flight time4 hrs, 29 mins
Most popular airlineAlaska Airlines
Average flights per week59

Finding cheap flights from St Louis to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from St Louis to Seattle is $262. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
4 hours and 29 minutes is the average flight time from St Louis to Seattle.
Alaska Airlines, American Airlines and Qatar Airways fly direct from St Louis to Seattle.
As of April 2026, there are 59 flights per week flying from St Louis to Seattle.
The cheapest month to fly from St Louis to Seattle is usually May.
If you're flying from St Louis Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from $262.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Seattle on Monday, 4 May 2026.
Yes – the average flight time is 4 hours and 29 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Frontier Airlines and Alaska Airlines offer the cheapest flight tickets to Seattle.

How to find cheap flights to Seattle (SEAA) from St Louis (STL) in 2024

Looking for cheap tickets from St Louis to Seattle? Return tickets start from $262 and one-way flights to Seattle from St Louis start from $121


Here are a few tips on how to secure the best flight price and make your journey as smooth as possible.

  • Simply hit 'search'. From British Airways to international carriers like Emirates, we compare all major airlines along with the most popular online travel agents to find the cheapest plane tickets.
  • Compare flight deals to Seattle from St Louis from over 1,000 providers. Then choose the cheapest or fastest plane tickets. Flight tickets to Seattle start from $121 one-way.
  • Flex your dates to find the best STL-SEAA ticket prices. If you are flexible when it comes to your travel dates, use Skyscanner's 'Whole month' tool to find the cheapest month, and even day to fly to Seattle from St Louis.
  • Set up a Price Alert. You can easily track the fare of your cheap flights by creating an alert. Whenever prices go down or up, you'll get an email or push notification to help make sure you get the best possible flight deal.
  • Fly without stops. Only interested in direct flights between St Louis and Seattle? Make sure to tick 'Direct flights only' when performing a search. If there are direct flights available on the route, these will appear in the results. Airlines that fly direct include: Alaska Airlines
    American Airlines
    Qatar Airways
    Southwest Airlines
    Hawaiian Airlines
    Japan Airlines
    Finnair
  • Find the cheapest Business class flights from St Louis and Seattle. We scour the internet for the best Business, Premium Economy and First Class flight fares to Seattle, too. Check the difference in price as you search – you might just chance upon a last-minute low fare. Note that not all cabin classes are available for every destination or airline.
  • Include nearby airports in your search. Widen your search for St Louis to Seattle flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save next time you travel.
  • Search for cheap flights regardless of where you are. To get the best flight booking experience when out and about, download the app and search for plane tickets between St Louis and Seattle whenever you want.

Combine your flight to Seattle from St Louis with hotels and car hire

Once you've secured your cheap flight ticket from St Louis to Seattle, discover the best prices and exclusive rates for hotels in Seattle or nearby. You can also compare hundreds of car hire companies in one go so that you get the best car hire price for your trip.


Plan the rest of your trip from St Louis to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.