฿3,360 Cheap Flights from Seattle (SEA) to St. Louis (STL)

View ฿3,360 flight on Wed, 8 Apr 2026Opens in a new window

Popular airlines from Seattle to St. Louis, MO (STL-Lambert-St. Louis Intl.)

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

Prices were available within the past 7 days and start at ฿3,360 for one-way flights and ฿10,415 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿10,415 Return, found 6 days ago
฿10,415
Return
found 6 days ago
Select Delta flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿10,415 found 6 days ago
American Airlines
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿11,210 Return, found 6 days ago
฿11,210
Return
found 6 days ago
Select American Airlines flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿11,210 found 6 days ago
Delta
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿11,860 Return, found 6 days ago
฿11,860
Return
found 6 days ago
Select Delta flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿11,860 found 6 days ago
American Airlines
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿12,330 Return, found 6 days ago
฿12,330
Return
found 6 days ago
Select American Airlines flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿12,330 found 6 days ago
American Airlines
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿12,815 Return, found 6 days ago
฿12,815
Return
found 6 days ago
Select American Airlines flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿12,815 found 6 days ago
Delta
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿12,825 Return, found 6 days ago
฿12,825
Return
found 6 days ago
Select Delta flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿12,825 found 6 days ago
Delta
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿12,975 Return, found 6 days ago
฿12,975
Return
found 6 days ago
Select Delta flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿12,975 found 6 days ago
United
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿12,985 Return, found 6 days ago
฿12,985
Return
found 6 days ago
Select United flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿12,985 found 6 days ago
United
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿13,155 Return, found 6 days ago
฿13,155
Return
found 6 days ago
Select United flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿13,155 found 6 days ago
American Airlines
Wed, 8 Apr - Fri, 17 Apr
SEA
Seattle
STL
St. Louis
฿13,615 Return, found 6 days ago
฿13,615
Return
found 6 days ago
Select American Airlines flight, departing Wed, 8 Apr from Seattle to St. Louis, returning Fri, 17 Apr, priced at ฿13,615 found 6 days ago

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

January is typically the cheapest month to fly

From ฿4,039 - ฿7,108 per traveller.
Flight from Seattle to St. Louis route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Return price
฿10,415
Distance
2728 km
Average flight time
5 hours 56 mins

Perfect flights from Seattle to St. Louis

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from Seattle to St. Louis. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Seattle - Tacoma Intl. to Lambert-St. Louis Intl. ticket options cater to your travel preferences, with incredible one-way fares from ฿3,360 and roundtrip prices from ฿10,415. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Lambert-St. Louis Intl. and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in St. Louis.

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 ฿10,415. 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.
*Available to Expedia members.