S$174 Cheap Flights from Seattle to St. Louis

View S$174 flight on Mon, 8 Jun, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Seattle to St. Louis (SEA-STL)

Prices were available within the past 7 days and start at S$174 for one-way flights and S$395 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$395 Return, found 4 days ago
S$395
Return
found 4 days ago
Select American Airlines flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$395 found 4 days ago
United
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$401 Return, found 4 days ago
S$401
Return
found 4 days ago
Select United flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$401 found 4 days ago
American Airlines
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$452 Return, found 4 days ago
S$452
Return
found 4 days ago
Select American Airlines flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$452 found 4 days ago
United
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$453 Return, found 4 days ago
S$453
Return
found 4 days ago
Select United flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$453 found 4 days ago
United
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$459 Return, found 4 days ago
S$459
Return
found 4 days ago
Select United flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$459 found 4 days ago
United
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$465 Return, found 4 days ago
S$465
Return
found 4 days ago
Select United flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$465 found 4 days ago
United
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$466 Return, found 4 days ago
S$466
Return
found 4 days ago
Select United flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$466 found 4 days ago
American Airlines
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$467 Return, found 4 days ago
S$467
Return
found 4 days ago
Select American Airlines flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$467 found 4 days ago
Delta
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$469 Return, found 4 days ago
S$469
Return
found 4 days ago
Select Delta flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$469 found 4 days ago
United
Thu, 23 Apr - Tue, 28 Apr
SEA
Seattle
STL
St. Louis
S$472 Return, found 4 days ago
S$472
Return
found 4 days ago
Select United flight, departing Thu, 23 Apr from Seattle to St. Louis, returning Tue, 28 Apr, priced at S$472 found 4 days ago

Frequently asked questions

How much is a flight from SEA to STL?
Based on fares listed within the last 7 days on Expedia for flights departing within the next year, round-trip flights between SEA and Lambert Field start from S$395. Book now to get the best price for your big adventure. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Lambert-St. Louis Intl. Airport (STL)?
The majority of flights can be cancelled online, but whether you incur a fee differs between airlines. If you do have to cancel your getaway, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Seattle - Tacoma Intl. Airport (SEA) to Lambert Field that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Seattle - Tacoma Intl. Airport (SEA) to STL flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Seattle - Tacoma Intl. Airport (SEA) to Lambert-St. Louis Intl. Airport (STL)?
The flight distance from SeaTac to St. Louis is 2,700 kilometres. Pack yourself a drink, a snack and an interesting book to read. Keep yourself entertained and the hours will zip by.
Which airlines fly direct from Sea-Tac Airport to STL?
A favourite with many savvy travellers, Alaska Airlines (AS) operates 30 monthly flights from SEA to STL. Pick the one that fits in with your travel plans and book your ticket today.
Are SEA to St. Louis Lambert International Airport flight tickets cheaper when they're purchased at the last minute?
Booking your trip from Sea-Tac Airport to St. Louis Lambert International Airport at the last minute could be your ticket to an awesome deal. However, it might cost you a whole lot more! If you'd prefer not to take any chances, book well ahead of your departure date. In fact, Expedia has some of the best bargains as far ahead as 12 months in advance. If your preferred air carrier hasn't released tickets yet, check back regularly as deals are updated on Expedia all the time.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Return price
S$394
Distance
2728 km
Average flight time
6 hours 45 mins

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