Cheap Flights from St. Louis (STL) to Seattle (SEA) from HK$693~

View HK$693 flight on Sat, 14 Feb 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Seattle

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

Prices were available within the past 7 days and start at HK$693 for one-way flights and HK$2,126 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,126 Return, found 3 days ago
HK$2,126
Return
found 3 days ago
Select Delta flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,126 found 3 days ago
Delta
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,481 Return, found 3 days ago
HK$2,481
Return
found 3 days ago
Select Delta flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,481 found 3 days ago
United
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,642 Return, found 3 days ago
HK$2,642
Return
found 3 days ago
Select United flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,642 found 3 days ago
American Airlines
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,781 Return, found 3 days ago
HK$2,781
Return
found 3 days ago
Select American Airlines flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,781 found 3 days ago
American Airlines
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,865 Return, found 3 days ago
HK$2,865
Return
found 3 days ago
Select American Airlines flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,865 found 3 days ago
United
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,954 Return, found 3 days ago
HK$2,954
Return
found 3 days ago
Select United flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,954 found 3 days ago
American Airlines
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$2,985 Return, found 3 days ago
HK$2,985
Return
found 3 days ago
Select American Airlines flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$2,985 found 3 days ago
Delta
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$3,072 Return, found 3 days ago
HK$3,072
Return
found 3 days ago
Select Delta flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$3,072 found 3 days ago
American Airlines
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$3,222 Return, found 3 days ago
HK$3,222
Return
found 3 days ago
Select American Airlines flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$3,222 found 3 days ago
United
Fri, 6 Mar - Sun, 15 Mar
STL
St. Louis
SEA
Seattle
HK$3,416 Return, found 3 days ago
HK$3,416
Return
found 3 days ago
Select United flight, departing Fri, 6 Mar from St. Louis to Seattle, returning Sun, 15 Mar, priced at HK$3,416 found 3 days ago

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

January is typically the cheapest month to fly

From HK$982 - HK$2,577 per traveller.
St. Louis to Seattle route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
HK$2,126
Distance
2728 km
Average flight time
2 hours 35 mins

Flights from St. Louis to Seattle

Book cheap flights from St. Louis (STL) to Seattle (SEA) 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 St. Louis (STL) to Seattle (SEA) 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 St. Louis (STL) to Seattle (SEA) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

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

If you would like to book flights to Seattle more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Seattle is HK$693 now!

 

Frequently asked questions

How much is a flight from St. Louis Lambert International Airport to Sea-Tac Airport?
If you're traveling between Lambert-St. Louis Intl. Airport (STL) and SEA, round-trip flights start from HK$2,126. This price is based on airfares available within the last 7 days on Expedia for flights departing within the next year, so don't delay. Book now and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Lambert-St. Louis Intl. Airport (STL) to Seattle - Tacoma Intl. Airport (SEA)?
Each airline has different terms and conditions. If you decide to cancel your vacation, visit our Customer Service Portal.
How do I find cheap flights from St. Louis Lambert International Airport to SEA 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 Lambert Field to Sea-Tac Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from St. Louis Lambert International Airport to Sea-Tac Airport?
It's around 2,700 kilometers between STL and SEA, so you'll be strapped into your seat for a while. Keep yourself entertained with things like your e-reader or a thrilling novel.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Seattle - Tacoma Intl. Airport (SEA)?
Offering 30 flights each month, Alaska Airlines (AS) is a popular choice when flying directly from St. Louis Lambert International Airport to Sea-Tac Airport.
Are STL to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from St. Louis Lambert International Airport to Sea-Tac Airport can be hit-or-miss. It is possible to find a bargain, but then again, you could miss out altogether! If you'd rather play it safe and start planning your trip ahead of time, Expedia compares flight deals up to 12 months in advance. Just bear in mind that not all airlines publish their prices so far in advance. Our advice? Check back often as prices are updated regularly.

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