£90 Cheap Flights from Seattle (SEA) to St. Louis (STL)

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

Prices were available within the past 7 days and start at £90 for one-way flights and £180 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Fri, 7 Jun - Sat, 15 Jun
SEA
Seattle
STL
St. Louis
£180 Return, found 4 days ago
£180
Return
found 4 days ago
Select Delta flight, departing Fri, 7 Jun from Seattle to St. Louis, returning Sat, 15 Jun, priced at £180 found 4 days ago
Delta
Tue, 11 Jun - Mon, 17 Jun
SEA
Seattle
STL
St. Louis
£181 Return, found 4 days ago
£181
Return
found 4 days ago
Select Delta flight, departing Tue, 11 Jun from Seattle to St. Louis, returning Mon, 17 Jun, priced at £181 found 4 days ago
Alaska Airlines
Tue, 11 Jun - Tue, 18 Jun
SEA
Seattle
STL
St. Louis
£185 Return, found 4 days ago
£185
Return
found 4 days ago
Select Alaska Airlines flight, departing Tue, 11 Jun from Seattle to St. Louis, returning Tue, 18 Jun, priced at £185 found 4 days ago
Alaska Airlines
Mon, 10 Jun - Mon, 17 Jun
SEA
Seattle
STL
St. Louis
£200 Return, found 4 days ago
£200
Return
found 4 days ago
Select Alaska Airlines flight, departing Mon, 10 Jun from Seattle to St. Louis, returning Mon, 17 Jun, priced at £200 found 4 days ago
Alaska Airlines
Tue, 4 Jun - Mon, 10 Jun
SEA
Seattle
STL
St. Louis
£205 Return, found 1 day ago
£205
Return
found 1 day ago
Select Alaska Airlines flight, departing Tue, 4 Jun from Seattle to St. Louis, returning Mon, 10 Jun, priced at £205 found 1 day ago
Alaska Airlines
Tue, 11 Jun - Tue, 18 Jun
SEA
Seattle
STL
St. Louis
£216 Return, found 4 days ago
£216
Return
found 4 days ago
Select Alaska Airlines flight, departing Tue, 11 Jun from Seattle to St. Louis, returning Tue, 18 Jun, priced at £216 found 4 days ago
Alaska Airlines
Tue, 11 Jun - Tue, 18 Jun
SEA
Seattle
STL
St. Louis
£220 Return, found 4 days ago
£220
Return
found 4 days ago
Select Alaska Airlines flight, departing Tue, 11 Jun from Seattle to St. Louis, returning Tue, 18 Jun, priced at £220 found 4 days ago
Alaska Airlines
Fri, 7 Jun - Mon, 10 Jun
SEA
Seattle
STL
St. Louis
£221 Return, found 4 days ago
£221
Return
found 4 days ago
Select Alaska Airlines flight, departing Fri, 7 Jun from Seattle to St. Louis, returning Mon, 10 Jun, priced at £221 found 4 days ago
Alaska Airlines
Tue, 11 Jun - Tue, 18 Jun
SEA
Seattle
STL
St. Louis
£228 Return, found 4 days ago
£228
Return
found 4 days ago
Select Alaska Airlines flight, departing Tue, 11 Jun from Seattle to St. Louis, returning Tue, 18 Jun, priced at £228 found 4 days ago
Delta
Tue, 11 Jun - Tue, 18 Jun
SEA
Seattle
STL
St. Louis
£230 Return, found 4 days ago
£230
Return
found 4 days ago
Select Delta flight, departing Tue, 11 Jun from Seattle to St. Louis, returning Tue, 18 Jun, priced at £230 found 4 days ago
Flight from Seattle to St. Louis route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines
Return price
£179
Distance
2728 km
Average flight time
5 hours 58 mins

Compare flights from Seattle to St. Louis easily and book in confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Seattle to St. Louis. Operating between them 11 flights per day, 20 airlines cover the route. And American Airlines, Qatar Airways, JAL, Alaska Airlines, Air Tahiti Nui fly direct, getting you to Lambert-St. Louis Intl. in just 7hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Seattle - Tacoma Intl. to Lambert-St. Louis Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Seattle - Tacoma Intl. (SEA) to Lambert-St. Louis Intl. (STL) 

The easiest way to view the best deals on flights from Seattle to St. Louis today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Seattle - Tacoma Intl. to Lambert-St. Louis Intl. start at just £180 and range up to £230.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Seattle and St. Louis
  • booking your flight during June, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Seattle to St. Louis flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Seattle - Tacoma Intl. to Lambert-St. Louis Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

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 £180. 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.
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