S$116 Cheap Flights from Seattle to St. Louis

View S$116 flight on Sat, 17 Jan, 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$116 for one-way flights and S$368 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$368 Return, found 2 hours ago
S$368
Return
found 2 hours ago
Select Delta flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$368 found 2 hours ago
Delta
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$390 Return, found 2 hours ago
S$390
Return
found 2 hours ago
Select Delta flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$390 found 2 hours ago
Delta
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$414 Return, found 2 hours ago
S$414
Return
found 2 hours ago
Select Delta flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$414 found 2 hours ago
Delta
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$415 Return, found 2 hours ago
S$415
Return
found 2 hours ago
Select Delta flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$415 found 2 hours ago
United
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$423 Return, found 2 hours ago
S$423
Return
found 2 hours ago
Select United flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$423 found 2 hours ago
United
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$428 Return, found 2 hours ago
S$428
Return
found 2 hours ago
Select United flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$428 found 2 hours ago
United
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$435 Return, found 2 hours ago
S$435
Return
found 2 hours ago
Select United flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$435 found 2 hours ago
Delta
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$437 Return, found 2 hours ago
S$437
Return
found 2 hours ago
Select Delta flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$437 found 2 hours ago
Delta
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$442 Return, found 2 hours ago
S$442
Return
found 2 hours ago
Select Delta flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$442 found 2 hours ago
American Airlines
Wed, 10 Dec - Wed, 17 Dec
SEA
Seattle
STL
St. Louis
S$472 Return, found 2 hours ago
S$472
Return
found 2 hours ago
Select American Airlines flight, departing Wed, 10 Dec from Seattle to St. Louis, returning Wed, 17 Dec, priced at S$472 found 2 hours ago

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Find the cheapest month to fly from Seattle (SEA) to St. Louis (STL)

January is typically the cheapest month to fly

From S$149 - S$282 per traveller.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from S$368
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city centre20 min
Flights from S$368
Seattle to St. Louis route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, United
Return price
S$368
Distance
2728 km
Average flight time
6 hours 50 mins

Perfect flights from Seattle to St. Louis

Your Journey from Seattle to St. Louis

Start your unforgettable journey with Expedia. Our broad selection of flights from Seattle to St. Louis caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including Delta, American Airlines, United. Our selection of flights from Seattle - Tacoma Intl. to Lambert-St. Louis Intl. caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with Seattle to St. Louis Flights

Experience the joy of finding cheap flights from Seattle - Tacoma Intl. to Lambert-St. Louis Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$116 and roundtrip prices from S$368*.
 

Pre-Flight Essentials

Ensure a smooth journey from Seattle to St. Louis with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant St. Louis

Picture yourself stepping off the plane in St. Louis and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your Seattle to St. Louis Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from Seattle to St. Louis.
 

Beyond the Flight – Exploring St. Louis

With Expedia, your adventure extends beyond the flight. Explore St. Louis at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from Seattle to St. Louis with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from Seattle to St. Louis with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

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$368. 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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*Available to Expedia members.