Cheap Flights From Seattle - Tacoma Intl. (SEA) To Lambert-St. Louis Intl. (STL)

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Cheapest Flights from Seattle (SEA) to St. Louis (STL)

The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were CA $332 round trip and CA $199 one way. Prices and availability subject to change. Additional terms may apply.

Fri, Jan 9 - Mon, Jan 26
SEA
Seattle
STL
St. Louis
CA $332 Roundtrip, found 5 days ago
CA $332
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Jan 9 from Seattle to St. Louis, returning Mon, Jan 26, priced at CA $332 found 5 days ago
Fri, Dec 5 - Thu, Dec 11
SEA
Seattle
STL
St. Louis
CA $337 Roundtrip, found 2 days ago
CA $337
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Seattle to St. Louis, returning Thu, Dec 11, priced at CA $337 found 2 days ago
Wed, Dec 31 - Tue, Jan 6
SEA
Seattle
STL
St. Louis
CA $377 Roundtrip, found 4 days ago
CA $377
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle to St. Louis, returning Tue, Jan 6, priced at CA $377 found 4 days ago
Wed, Dec 31 - Tue, Jan 6
SEA
Seattle
STL
St. Louis
CA $378 Roundtrip, found 4 days ago
CA $378
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle to St. Louis, returning Tue, Jan 6, priced at CA $378 found 4 days ago
Tue, Dec 30 - Mon, Jan 5
SEA
Seattle
STL
St. Louis
CA $404 Roundtrip, found 4 days ago
CA $404
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Tue, Dec 30 from Seattle to St. Louis, returning Mon, Jan 5, priced at CA $404 found 4 days ago
Sun, Nov 16 - Thu, Nov 20
SEA
Seattle
STL
St. Louis
CA $418 Roundtrip, found 6 days ago
CA $418
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Sun, Nov 16 from Seattle to St. Louis, returning Thu, Nov 20, priced at CA $418 found 6 days ago
Mon, Apr 27 - Thu, Apr 30
SEA
Seattle
STL
St. Louis
CA $430 Roundtrip, found 14 hours ago
CA $430
Roundtrip
found 14 hours ago
Select Alaska Airlines flight, departing Mon, Apr 27 from Seattle to St. Louis, returning Thu, Apr 30, priced at CA $430 found 14 hours ago
Fri, Jan 9 - Mon, Jan 26
SEA
Seattle
STL
St. Louis
CA $462 Roundtrip, found 5 days ago
CA $462
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Jan 9 from Seattle to St. Louis, returning Mon, Jan 26, priced at CA $462 found 5 days ago
Wed, Jul 22 - Mon, Jul 27
SEA
Seattle
STL
St. Louis
CA $488 Roundtrip, found 6 days ago
CA $488
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Jul 22 from Seattle to St. Louis, returning Mon, Jul 27, priced at CA $488 found 6 days ago
Fri, Jan 9 - Mon, Jan 26
SEA
Seattle
STL
St. Louis
CA $500 Roundtrip, found 5 days ago
CA $500
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Jan 9 from Seattle to St. Louis, returning Mon, Jan 26, priced at CA $500 found 5 days ago
Mon, Apr 27 - Fri, May 1
SEA
Seattle
STL
St. Louis
CA $514 Roundtrip, found 14 hours ago
CA $514
Roundtrip
found 14 hours ago
Select Alaska Airlines flight, departing Mon, Apr 27 from Seattle to St. Louis, returning Fri, May 1, priced at CA $514 found 14 hours ago
Wed, Dec 31 - Sat, Jan 3
SEA
Seattle
STL
St. Louis
CA $522 Roundtrip, found 4 days ago
CA $522
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle to St. Louis, returning Sat, Jan 3, priced at CA $522 found 4 days ago
Wed, Dec 31 - Sat, Jan 3
SEA
Seattle
STL
St. Louis
CA $523 Roundtrip, found 4 days ago
CA $523
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle to St. Louis, returning Sat, Jan 3, priced at CA $523 found 4 days ago
Fri, Dec 5 - Thu, Dec 11
SEA
Seattle
STL
St. Louis
CA $524 Roundtrip, found 2 days ago
CA $524
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Seattle to St. Louis, returning Thu, Dec 11, priced at CA $524 found 2 days ago
Tue, Dec 2 - Fri, Dec 5
SEA
Seattle
STL
St. Louis
CA $534 Roundtrip, found 1 hour ago
CA $534
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Tue, Dec 2 from Seattle to St. Louis, returning Fri, Dec 5, priced at CA $534 found 1 hour ago
Wed, Dec 31 - Tue, Jan 6
SEA
Seattle
STL
St. Louis
CA $535 Roundtrip, found 4 days ago
CA $535
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle to St. Louis, returning Tue, Jan 6, priced at CA $535 found 4 days ago
Wed, Dec 31 - Tue, Jan 6
SEA
Seattle
STL
St. Louis
CA $537 Roundtrip, found 4 days ago
CA $537
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Dec 31 from Seattle to St. Louis, returning Tue, Jan 6, priced at CA $537 found 4 days ago

Frequently asked questions

Are there direct flights from Seattle - Tacoma Intl. Airport (SEA) to St. Louis Lambert International Airport?
If you're hoping to get from SEA to St. Louis Lambert International Airport in the shortest possible time, you'll be glad to know multiple airlines operate nonstop flights. Select your favorite seat with Southwest Airlines or Alaska Airlines.
What airlines fly from Seattle - Tacoma Intl. Airport (SEA) to Lambert-St. Louis Intl. Airport (STL)?
There are several airlines that offer direct flights from Seattle - Tacoma Intl. Airport (SEA) to Lambert-St. Louis Intl. Airport (STL). Southwest Airlines (WN) is among the best of them, and operates around 30 flights each month. You should also browse the deals on offer from Alaska Airlines (AS). Another popular airline, it operates 30 flights every month on the Seattle to St. Louis route. Be sure to compare the two to find your perfect fare.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Popular Flight Routes from Seattle (SEA)

Travelers at SEA love to visit these top cities. Roam to the top destinations from Seattle (SEA) today with the cheap prices from Travelocity!

Popular Flight Routes from St. Louis (STL)

Travelers at STL love to visit these top cities. Roam to the top destinations from St. Louis(STL) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.