Cheap Flight Tickets from St Louis (STL) to Seattle (SEA), Starting at $343

Good to Know: Cheapest and Fastest STL - SEA Flights

Useful information for finding best airline tickets from Lambert St Louis International to Seattle Tacoma International on your next trip.

Cheapest Round Trip Flight

$343

WN Southwest Airlines • 1 stop • 12h 5m

Aug 14 – Aug 17

The cheapest round trip flight from St Louis to Seattle (STL-SEA-STL) is currently $343

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Cheapest Direct Flight

$463

WN Southwest Airlines • nonstop • 7h

Aug 14

The cheapest nonstop flight from St Louis to Seattle (STL-SEA) is currently $463

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Fastest Flight

7h

The fastest nonstop flight from St Louis to Seattle (STL-SEA) takes 7h

Top Airlines Flying from St Louis to Seattle

Southwest Airlines-WN

Southwest Airlines

Alaska Airlines -AS

Alaska Airlines

Delta Airline, DL

Delta Airlines

United Airlines, UA

United Airlines

American Airlines, AA

American Airlines

Latest Flight Deals from St Louis (STL) to Seattle (SEA)

Compare and book low fare round-trip air tickets from St Louis to Seattle. Ideal for travelers with confirmed return itineraries.

Aug 14 - Aug 17, Economy
WN
St Louis → Seattle
12h 5m
5:30 PM - 10:55 PM • 1 stop
WN
St Louis → Seattle
15h 5m
5:15 AM - 4:20 PM • 1 stop
$343
Southwest Airlines
Aug 14 - Aug 17, Economy
WN
St Louis → Seattle
12h 35m
8:00 AM - 1:55 PM • 1 stop
WN
St Louis → Seattle
20h 35m
8:20 PM - 10:55 AM • 1 stop
$343
Southwest Airlines
Aug 14 - Aug 17, Economy
WN
St Louis → Seattle
17h 35m
2:00 PM - 10:55 PM • 1 stop
WN
St Louis → Seattle
15h 5m
5:15 AM - 4:20 PM • 1 stop
$343
Southwest Airlines
Aug 14 - Aug 17, Economy
AS
St Louis → Seattle
7h 8m
6:02 AM - 8:30 AM • nonstop
AS
St Louis → Seattle
12h 35m
6:42 AM - 4:37 PM • 1 stop
$702
Alaska Airlines
Aug 14 - Aug 17, Economy
AS
St Louis → Seattle
7h 8m
7:56 PM - 10:24 PM • nonstop
AS
St Louis → Seattle
5h 55m
6:04 PM - 11:59 PM • nonstop
$717
Alaska Airlines
Aug 14 - Aug 17, Economy
AS
St Louis → Seattle
12h 18m
5:42 AM - 11:20 AM • 1 stop
AS
St Louis → Seattle
12h 35m
6:42 AM - 4:37 PM • 1 stop
$1066
Alaska Airlines

Fly from St Louis to Seattle with the Best Airfare Deals on FareLeaders

Looking for a cheap last-minute deal or the best round-trip flight from St Louis to Seattle? Find the biggest savings on one-way and round-trip tickets right here.

FAQs on St Louis to Seattle Flights

What are the airports in St Louis?
STL
What’s the most popular airline flying from STL to SEA?
The most popular airline flying from St Louis to Seattle are
Can I fly from STL to SEA non-stop?
Yes, you can fly STL to SEA non-stop on
Which airlines fly nonstop between St Louis and Seattle?
The non-stop flights between St Louis and Seattle are .
What’s the earliest departure time from STL to SEA Airport?
The earliest flight leaves STL at 5:42 am and lands in SEA - Seattle Tacoma International
What are the airports in Seattle?
SEA
Can I make changes to my St Louis to Seattle flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from STL to SEA?
Read the fare rules of the St Louis to Seattle air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from St Louis and Seattle?
operate flights between St Louis and Seattle
How long does a flight from St Louis to Seattle take?
It takes approximately 4 hour to fly non-stop from STL to SEA, which is 1709.07 miles by air.
Which airlines provide the cheapest flights from St Louis (STL) to Seattle (SEA) ?
In the past couple of days, the cheapest tickets to SEA from STL were found on AS : USD 702
Do I need a passport to fly between STL and SEA?
No
What’s the latest departure time from STL to SEA ?
The last flight leaves STL at 7:56 pm

St Louis (STL) to Seattle (SEA): Airport Information

Origin Airport Lambert St Louis International , St Louis, US
Destination Airport Seattle Tacoma International , Seattle, US
Distance 1709 miles

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