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Cheap flights from St Louis to Seattle (STL - SEA)

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How to find the cheapest flight from
St Louis (STL) to Seattle (SEA)

What is the cheapest day to fly round-trip from St Louis to Seattle?

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 16% on the overall cost on flights from St Louis to Seattle.

How far in advance should I book a flight from St Louis to Seattle?

Find a great deal and save up to 58% by booking at least 27 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St Louis to Seattle within the next two weeks, with the cheapest ticket starting at $136.

When is the cheapest time to fly from St Louis to Seattle (STL - 03A)?

One of the essential ways to save on airfare from St Louis to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. If a flight is in the noon is possible it can save you up to 22% on airfare.

Cheap flights from St Louis to Seattle in August, September 2020

The best prices found for STL to SEA flights for August, September
13 Aug - 16 Aug
$159pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Sun Country Air
 
1 STOP
STL
Lambert-St Louis
13 Aug - 16 Aug
$160pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Sun Country Air
 
1 STOP
STL
Lambert-St Louis
15 Aug - 24 Aug
$161pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
   
2 STOPS
STL
Lambert-St Louis

St Louis to Seattle 2020 flight deals

Cheap flights to Seattle from St Louis found for this year
13 Aug - 16 Aug
$159pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Sun Country Air
 
1 STOP
STL
Lambert-St Louis
13 Aug - 16 Aug
$160pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Sun Country Air
 
1 STOP
STL
Lambert-St Louis
15 Aug - 24 Aug
$161pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
United Airlines
   
2 STOPS
STL
Lambert-St Louis

Non-stop flights to Seattle from St Louis

Save time with St Louis to Seattle direct flight deals
31 Jul - 3 Aug
$403pp
STL
Lambert-St Louis
Major Airline
Non-Stop
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Major Airline
Non-Stop
STL
Lambert-St Louis

Last minute flights from St Louis to Seattle

Late deals on round-trip flights to Seattle from St Louis, departing today and this week
26 Jul - 2 Aug
$199pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Sun Country Air
 
1 STOP
STL
Lambert-St Louis
26 Jul - 2 Aug
$203pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
26 Jul - 30 Jul
$227pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
SEA
Seattle/Tacoma Intl
Delta
 
1 STOP
STL
Lambert-St Louis

One-way flights to Seattle from St Louis

The cheapest one-way flights from St Louis to Seattle
7:00 am - 12:46 pm
Sun Country Air
1 Stop
7h 46m
STL - SEA
Sun Country Air
$139
FlyFar
10:25 am - 5:01 pm
Delta
1 Stop
8h 36m
STL - SEA
Delta
$153
Delta
1:45 pm - 8:56 am
Multiple Airlines
2 Stops
21h 11m
STL - SEA
Multiple Airlines
$166
Kiwi.com

Related info for your journey

Useful info, stats and facts about St Louis to Seattle flights.

Flight FAQs

From St Louis to Seattle

Are flight prices decreasing from St Louis to Seattle due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both St Louis and Seattle for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Can I find flights from St Louis to Seattle for under $200 on Cheapflights?

Yes, there are multiple flights from St Louis to Seattle for under $200. The cheapest flight booked recently is on Multiple Airlines for just $159, but on average you can expect to pay $192.

Are there nonstop flights from St Louis to Seattle for under $500 on Cheapflights?

Cheapflights has at least 1 direct flight from St Louis to Seattle under $500. A good price for a nonstop flight from St Louis to Seattle is less than $403.

Are there last-minute flights available from St Louis to Seattle for under $200?

There are currently 20+ open flights from St Louis to Seattle within the next 7 days for less than $200.

Is St Louis weather warmer or cooler than Seattle?

Our data indicates that the weather will be 90 °F on average in the month of July. The temperature in Seattle is typically colder than in St Louis. If you're traveling when the temperature is at its warmest, push to plan early, as flight price and availability will have an impact on your travels. For the best results, search for flights well in advance or after peak season.

How long is the flight from St Louis to Seattle?

There are many flights that can get you from St Louis to Seattle in 7h 26m. Fly via Sun Country Air, Delta, or Allegiant Air to get the fastest option. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from St Louis to Seattle round-trip?

Cheapflights users have booked flights from St Louis to Seattle round-trip from $201. Another airline that can offer you cheap pricing is Allegiant Air.

What are the cheapest airlines to fly from St Louis to Seattle one-way?

The cheapest airlines for a one-way flight from St Louis to Seattle are Sun Country Air ($99), Delta ($123), and Major Airline ($174).

Alternative routes for St Louis to Seattle

Destination information for Seattle

Things to know before you go. Useful info for your trip from St Louis to Seattle
Average temperature for August in Seattle
77.0 °F
Avg rainfall for August in Seattle
1.1 ″

Airports servicing St. Louis

Airports servicing Seattle

Seattle King County/Boeing (BFI)
Seattle Lake Union Spb (LKE)

Hourly flight availability from St Louis to Seattle

Afternoon Noon to 6 PM 100% of STL to SEA departures
Early morning Midnight to 6 AM 0% of STL to SEA departures
Morning 6 AM to noon 0% of STL to SEA departures
Evening 6 PM to midnight 0% of STL to SEA departures
Midnight
6 AM
Noon
6 PM
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