Cheap Flights from Seattle (SEA) to St. Louis (STL) from HK$747~

View HK$747 flight on Sat, 10 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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Find Cheap Flights from Seattle (SEA) to St. Louis (STL)

Prices were available within the past 7 days and start at HK$747 for one-way flights and HK$1,719 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$1,719 Return, found 14 hours ago
HK$1,719
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$1,719 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$1,901 Return, found 14 hours ago
HK$1,901
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$1,901 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$1,998 Return, found 14 hours ago
HK$1,998
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$1,998 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,073 Return, found 14 hours ago
HK$2,073
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,073 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,192 Return, found 14 hours ago
HK$2,192
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,192 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,308 Return, found 14 hours ago
HK$2,308
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,308 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,353 Return, found 14 hours ago
HK$2,353
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,353 found 14 hours ago
American Airlines
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,354 Return, found 14 hours ago
HK$2,354
Return
found 14 hours ago
Select American Airlines flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,354 found 14 hours ago
Delta
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,503 Return, found 14 hours ago
HK$2,503
Return
found 14 hours ago
Select Delta flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,503 found 14 hours ago
United
Wed, 20 Aug - Sun, 24 Aug
SEA
Seattle
STL
St. Louis
HK$2,590 Return, found 14 hours ago
HK$2,590
Return
found 14 hours ago
Select United flight, departing Wed, 20 Aug from Seattle to St. Louis, returning Sun, 24 Aug, priced at HK$2,590 found 14 hours ago

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

November is typically the cheapest month to fly

From HK$1,083 - HK$3,175 per traveller.

Graph displaying average flight prices per month

Seattle to St. Louis route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Lambert-St. Louis Intl.
Return price
HK$1,719
Distance
2728 km
Average flight time
5 hours 53 mins

Flights from Seattle to St. Louis

Book cheap flights from Seattle (SEA) to St. Louis (STL) on Expedia.com.hk. Find the best flight deals to destinations around the world for your next leisure or business travel on Expedia.com.hk.

Search for flights from Seattle (SEA) to St. Louis (STL) to find great flight deals suitable to your travel date and time. Expedia.com.hk flight booking search engine is simple to use and looking for cheap flights is as easy as a click of a mouse or on your mobile devices.

Be assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your Seattle (SEA) to St. Louis (STL) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

Save more when combine your St. Louis flight with a hotel for a package deal! Discover additional savings by booking in advance. Now you can find activities in St. Louis and things to do in St. Louis for your perfect vacation with Expedia Thing to Do.

If you would like to book flights to St. Louis more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to St. Louis is HK$747 now!

 

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 HK$1,719. 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 canceled 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 kilometers. 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 favorite with many savvy travelers, 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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