Cheap flights from St. Louis to North Seattle

View AU$135 flight on Tue, 23 Sep. 2025Opens in a new window

Popular airlines from St. Louis to North Seattle

  • Jetstar

    Jetstar

  • Qantas Airways

    Qantas Airways

  • Virgin Australia

    Virgin Australia

  • Scoot

    Scoot

  • American Airlines

    American Airlines

  • Emirates

    Emirates

  • United

    United

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

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, 4 Aug. - Fri, 8 Aug.
STL
St. Louis
SEA
Seattle
AU$800 Return, found 8 hours ago
AU$800
Return
found 8 hours ago
Select Delta flight, departing Mon, 4 Aug. from St. Louis to Seattle, returning Fri, 8 Aug., priced at AU$800 found 8 hours ago
American Airlines
Mon, 4 Aug. - Fri, 8 Aug.
STL
St. Louis
SEA
Seattle
AU$815 Return, found 8 hours ago
AU$815
Return
found 8 hours ago
Select American Airlines flight, departing Mon, 4 Aug. from St. Louis to Seattle, returning Fri, 8 Aug., priced at AU$815 found 8 hours ago
United
Mon, 4 Aug. - Fri, 8 Aug.
STL
St. Louis
SEA
Seattle
AU$861 Return, found 8 hours ago
AU$861
Return
found 8 hours ago
Select United flight, departing Mon, 4 Aug. from St. Louis to Seattle, returning Fri, 8 Aug., priced at AU$861 found 8 hours ago
United
Mon, 4 Aug. - Fri, 8 Aug.
STL
St. Louis
SEA
Seattle
AU$868 Return, found 8 hours ago
AU$868
Return
found 8 hours ago
Select United flight, departing Mon, 4 Aug. from St. Louis to Seattle, returning Fri, 8 Aug., priced at AU$868 found 8 hours ago
Delta
Mon, 4 Aug. - Fri, 8 Aug.
STL
St. Louis
SEA
Seattle
AU$883 Return, found 8 hours ago
AU$883
Return
found 8 hours ago
Select Delta flight, departing Mon, 4 Aug. from St. Louis to Seattle, returning Fri, 8 Aug., priced at AU$883 found 8 hours ago
Alaska Airlines
Mon, 4 Aug. - Fri, 8 Aug.
STL
St. Louis
SEA
Seattle
AU$889 Return, found 8 hours ago
AU$889
Return
found 8 hours ago
Select Alaska Airlines flight, departing Mon, 4 Aug. from St. Louis to Seattle, returning Fri, 8 Aug., priced at AU$889 found 8 hours ago

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

September is typically the cheapest month to fly

From AU$212 - AU$323 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.