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Uncover the best deals on St Louis to Seattle flights by comparing fares from hundreds of airlines and agencies.
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
$126
American Airlines
• 1 stop
• 15h 18m
Oct 17 – Oct 20
The cheapest round trip flight from St Louis to Seattle (STL-SEA-STL) is currently $126
Cheapest One way Flight
$112
Southwest Airlines
• 1 stop
• 13h 35m
Oct 17
The cheapest one way flight from St Louis to Seattle (STL-SEA) is currently $112
Cheapest Direct Flight
$154
Alaska Airlines
• nonstop
• 7h 11m
Oct 17
The cheapest nonstop flight from St Louis to Seattle (STL-SEA) is currently $154
Fastest Flight
7h 8m
The fastest nonstop flight from St Louis to Seattle (STL-SEA) takes 7h 8m
Top Airlines Flying from St Louis to Seattle
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.
Oct 17 - Oct 20, Economy
St Louis → Seattle
15h 18m
5:00 AM - 12:18 PM • 1 stop
St Louis → Seattle
34h 17m
4:27 PM - 3:24 PM • 1 stop
American Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
7h 11m
- • nonstop
St Louis → Seattle
5h 56m
- • nonstop
Alaska Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
15h 18m
- • 1 stop
St Louis → Seattle
5h 56m
- • nonstop
American Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
15h 8m
- • 1 stop
St Louis → Seattle
5h 56m
- • nonstop
American Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
12h 5m
- • 1 stop
St Louis → Seattle
9h
- • 1 stop
United Airlines
Explore competitive one-way airfare options for STL - SEA flights. Best suited for flexible or open-ended travel plans.
Flying to Seattle soon? We've surfaced some of the most affordable last-minute flights from St Louis to Seattle, ideal for urgent plans or spontaneous trips.
Looking for the fastest way to Seattle? These direct flight options from STL to SEA offer both convenience and value—no layovers, just straight to your destination.
Oct 17 - Oct 20, Economy
St Louis → Seattle
7h 11m
- • nonstop
St Louis → Seattle
5h 56m
- • nonstop
Alaska Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
7h 8m
- • nonstop
St Louis → Seattle
5h 56m
- • nonstop
Alaska Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
7h 8m
- • nonstop
St Louis → Seattle
5h 56m
- • nonstop
American Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
7h 11m
- • nonstop
St Louis → Seattle
5h 56m
- • nonstop
American Airlines
Oct 17 - Oct 20, Economy
St Louis → Seattle
7h 11m
6:02 AM - 8:33 AM • nonstop
St Louis → Seattle
6h 44m
9:40 AM - 3:44 PM • nonstop
Alaska Airlines
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 5:00 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 AA : USD 290
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 4:4200 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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