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 $303 round trip and CA $300 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Feb 21 - Sat, Feb 28
SEA
Seattle
STL
St. Louis
CA $303 Roundtrip, found 5 days ago
CA $303
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Feb 21 from Seattle to St. Louis, returning Sat, Feb 28, priced at CA $303 found 5 days ago
Mon, Jan 5 - Wed, Jan 7
SEA
Seattle
STL
St. Louis
CA $314 Roundtrip, found 2 days ago
CA $314
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Mon, Jan 5 from Seattle to St. Louis, returning Wed, Jan 7, priced at CA $314 found 2 days ago
Fri, Feb 13 - Mon, Feb 16
SEA
Seattle
STL
St. Louis
CA $330 Roundtrip, found 5 days ago
CA $330
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Feb 13 from Seattle to St. Louis, returning Mon, Feb 16, priced at CA $330 found 5 days ago
Thu, Feb 5 - Mon, Feb 9
SEA
Seattle
STL
St. Louis
CA $336 Roundtrip, found 1 day ago
CA $336
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle to St. Louis, returning Mon, Feb 9, priced at CA $336 found 1 day ago
Wed, Mar 18 - Wed, Mar 25
SEA
Seattle
STL
St. Louis
CA $363 Roundtrip, found 4 days ago
CA $363
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Mar 18 from Seattle to St. Louis, returning Wed, Mar 25, priced at CA $363 found 4 days ago
Wed, Mar 18 - Sat, Mar 28
SEA
Seattle
STL
St. Louis
CA $364 Roundtrip, found 2 days ago
CA $364
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Mar 18 from Seattle to St. Louis, returning Sat, Mar 28, priced at CA $364 found 2 days ago
Wed, Mar 18 - Wed, Mar 25
SEA
Seattle
STL
St. Louis
CA $372 Roundtrip, found 4 days ago
CA $372
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Wed, Mar 18 from Seattle to St. Louis, returning Wed, Mar 25, priced at CA $372 found 4 days ago
Wed, Mar 18 - Sat, Mar 28
SEA
Seattle
STL
St. Louis
CA $373 Roundtrip, found 2 days ago
CA $373
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Mar 18 from Seattle to St. Louis, returning Sat, Mar 28, priced at CA $373 found 2 days ago
Tue, Dec 30 - Mon, Jan 5
SEA
Seattle
STL
St. Louis
CA $403 Roundtrip, found 4 days ago
CA $403
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 $403 found 4 days ago
Mon, Jan 19 - Thu, Jan 22
SEA
Seattle
STL
St. Louis
CA $417 Roundtrip, found 2 days ago
CA $417
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Mon, Jan 19 from Seattle to St. Louis, returning Thu, Jan 22, priced at CA $417 found 2 days ago
Fri, Feb 13 - Mon, Feb 16
SEA
Seattle
STL
St. Louis
CA $467 Roundtrip, found 5 days ago
CA $467
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Feb 13 from Seattle to St. Louis, returning Mon, Feb 16, priced at CA $467 found 5 days ago
Fri, Feb 13 - Mon, Feb 16
SEA
Seattle
STL
St. Louis
CA $481 Roundtrip, found 5 days ago
CA $481
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Feb 13 from Seattle to St. Louis, returning Mon, Feb 16, priced at CA $481 found 5 days ago
Thu, Feb 5 - Mon, Feb 9
SEA
Seattle
STL
St. Louis
CA $523 Roundtrip, found 1 day ago
CA $523
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Feb 5 from Seattle to St. Louis, returning Mon, Feb 9, priced at CA $523 found 1 day ago
Fri, Aug 7 - Sun, Aug 9
SEA
Seattle
STL
St. Louis
CA $536 Roundtrip, found 5 days ago
CA $536
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Aug 7 from Seattle to St. Louis, returning Sun, Aug 9, priced at CA $536 found 5 days ago
Tue, Dec 30 - Mon, Jan 5
SEA
Seattle
STL
St. Louis
CA $537 Roundtrip, found 1 day ago
CA $537
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Dec 30 from Seattle to St. Louis, returning Mon, Jan 5, priced at CA $537 found 1 day ago
Fri, Aug 7 - Sun, Aug 9
SEA
Seattle
STL
St. Louis
CA $552 Roundtrip, found 5 days ago
CA $552
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Aug 7 from Seattle to St. Louis, returning Sun, Aug 9, priced at CA $552 found 5 days ago
Fri, Aug 7 - Sun, Aug 9
SEA
Seattle
STL
St. Louis
CA $557 Roundtrip, found 5 days ago
CA $557
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Fri, Aug 7 from Seattle to St. Louis, returning Sun, Aug 9, priced at CA $557 found 5 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.