$164 Cheap American Airlines flights St. Louis (STL) to Seattle (SEA)

View $164 flight on Thu, Aug 20, 2026Opens in a new window

$164 Cheap American Airlines flights St. Louis (STL) to Seattle (SEA)

Prices were available within the past 7 days and start at $164 for one-way flights and $319 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Aug 20 - Sat, Aug 29
STL
St. Louis
SEA
Seattle
$319 Roundtrip, found 1 day ago
$319
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Aug 20 from St. Louis to Seattle, returning Sat, Aug 29, priced at $319 found 1 day ago
American Airlines
Thu, Aug 20 - Sat, Aug 29
STL
St. Louis
SEA
Seattle
$328 Roundtrip, found 1 day ago
$328
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Aug 20 from St. Louis to Seattle, returning Sat, Aug 29, priced at $328 found 1 day ago
American Airlines
Thu, Aug 20 - Sat, Aug 29
STL
St. Louis
SEA
Seattle
$334 Roundtrip, found 1 day ago
$334
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Aug 20 from St. Louis to Seattle, returning Sat, Aug 29, priced at $334 found 1 day ago

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

January is typically the cheapest month to fly

From $126 - $331 per traveler.
Flights from St. Louis (STL) to Seattle (SEA)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Southwest Airlines, United
Popular airline
United
Distance
2728 km
Average flight time
4 hours 50 mins