Flights from St. Louis to Seattle Tacoma

Our cheapest offers for flights from St. Louis to Seattle Tacoma

Here you can compare cheap flights from St. Louis (STL) to Seattle Tacoma (SEA) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to Seattle Tacoma. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Best option
St. Louis
Seattle-Tacoma
Outbound
10/18/25
direct
HA7126
04h 27min
Return
11/17/25
direct
HA6939
03h 56min
Hawaiian Airlines ?
$214
St. Louis
Seattle-Tacoma
Pay attention to transfer at connecting flight
Outbound
07/25/25
2 Stopovers (DTW, LAS)
NK3897, NK2369, NK0781
33h 09min
Return
08/17/25
2 Stopovers (LAS, DTW)
NK0782, NK2376, NK3896
12h 51min
Spirit Airlines
$458
St. Louis
Seattle-Tacoma
Outbound
10/18/25
direct
AS0388
04h 27min
Return
11/17/25
direct
AS0388
03h 52min
Alaska Airlines ?
$225
St. Louis
Seattle-Tacoma
Outbound
10/18/25
direct
AS0388
04h 27min
Return
11/17/25
direct
AS0472
03h 56min
Alaska Airlines
$230
St. Louis
Seattle-Tacoma
Outbound
10/18/25
direct
AS0388
04h 27min
Return
11/17/25
direct
AS0472
03h 56min
Alaska Airlines ?
$231
St. Louis
Seattle-Tacoma
Outbound
09/19/25
direct
AS0291
04h 24min
Return
09/29/25
direct
AS0472
03h 56min
Alaska Airlines ?
$235
St. Louis
Seattle-Tacoma
Outbound
09/04/25
1 Stopover (DFW)
AA1363, AA1809
08h 39min
Return
09/28/25
direct
AS0472
03h 56min
American Airlines ?
$236
St. Louis
Seattle-Tacoma
Outbound
10/18/25
1 Stopover (DEN)
F94567, F93405
06h 39min
Return
11/17/25
1 Stopover (DEN)
F93406, F93302
25h 07min
Frontier Airlines
$237
St. Louis
Seattle-Tacoma
Outbound
10/18/25
direct
AS0388
04h 27min
Return
11/17/25
direct
HA6938
03h 52min
Alaska Airlines
$240
St. Louis
Seattle-Tacoma
Outbound
10/18/25
1 Stopover (DFW)
AA1363, AA2003
07h 07min
Return
11/17/25
1 Stopover (DFW)
AA0757, AA1010
06h 25min
American Airlines ?
$246
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from St. Louis to Seattle Tacoma

Favorite airline: Alaska Airlines
Alaska Airlines is the most popular airline for flights from St. Louis to Seattle-Tacoma.
Alaska Airlines
33 %
Delta
22 %
Spirit Airlines
14 %
Stopover flights are the cheapest connection
Direct flights on this route are $42.00 more expensive on average than flights with a stopover.
non stop flight
1 stop
04h 20min
16h 00min
$232
$190
The favorite connection is non-stop
Non-stop flights are especially popular on this route. 32 % of travelers will book a direct flight.
Route
bookings
Direct flights
04h 20min, from $232
32 %
1 stopover Salt Lake City International Airport, UT
07h 08min, from $210
28 %
1 stopover Las Vegas - McCarran International Airport, NV
07h 54min, from $307
20 %

Important flight information

Flight information: St. Louis - Seattle-Tacoma

Roundtrip from $213.04
Flight duration min. 04:35 / max. 11:35
Return flight duration min. 03:45/ max. 06:20
Distance 2748 km
Flights per week 23
Departure airport Airport St. Louis - Lambert International Airport (STL)
Arrival airport Airport Seattle-Tacoma International Airport, WA (SEA)
Destination country Flights to United States
Alternative routes to United States
Alternative flights to Seattle-Tacoma
Flight destinations with a similar price
Flight destinations with a similar price