Southwest® flights from St. Louis to Seattle/Tacoma from $124

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Low fares from St. Louis to Seattle/Tacoma

$

St. Louis (STL)to

Seattle/Tacoma (SEA)
Depart: 01/13/2027

One-way

Basic

From
$124
Seen: 19 hrs ago

St. Louis (STL)to

Seattle/Tacoma (SEA)
Depart: 02/13/2027

One-way

Basic

From
$124
Seen: 8 hrs ago

St. Louis (STL)to

Seattle/Tacoma (SEA)
Depart: 12/15/2026

One-way

Basic

From
$124
Seen: 11 hrs ago

St. Louis (STL)to

Seattle/Tacoma (SEA)
Depart: 02/04/2027

One-way

Basic

From
$134
Seen: 19 hrs ago

St. Louis (STL)to

Seattle/Tacoma (SEA)
Depart: 02/18/2027

One-way

Basic

From
$134
Seen: 13 hrs ago

St. Louis (STL)to

Seattle/Tacoma (SEA)
Depart: 01/20/2027

One-way

Basic

From
$134
Seen: 12 hrs ago

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Explore flights from St. Louis to Seattle/Tacoma

Nov 2026
From$254*
Seen: 7 hrs ago
One Way/Basic
Dec 2026
From$124*
Seen: 11 hrs ago
One Way/Basic
Jan 2027
From$124*
Seen: 19 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $170
cmp-daily-histogram-bars-legend-max-price-aria-label $559
Displaying fares for November-2026
  • STL–SEA, 11/12/2026: From $268
    12

    Thu

    NOV

  • STL–SEA, 11/13/2026: From $268
    13

    Fri

  • STL–SEA: cmp-view-offers-disclaimer. Find Offers
    14

    Sat

  • STL–SEA: cmp-view-offers-disclaimer. Find Offers
    15

    Sun

  • STL–SEA: cmp-view-offers-disclaimer. Find Offers
    16

    Mon

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    17

    Tue

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    18

    Wed

  • STL–SEA, 11/19/2026: From $268
    19

    Thu

  • STL–SEA, 11/20/2026: From $268
    20

    Fri

  • STL–SEA, 11/21/2026: From $254
    21

    Sat

  • STL–SEA, 11/22/2026: From $268
    22

    Sun

  • STL–SEA: cmp-view-offers-disclaimer. Find Offers
    23

    Mon

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    24

    Tue

  • STL–SEA, 11/25/2026: From $254
    25

    Wed

  • STL–SEA, 11/26/2026: From $268
    26

    Thu

  • STL–SEA, 11/27/2026: From $295
    27

    Fri

  • STL–SEA, 11/28/2026: From $559
    28

    Sat

  • STL–SEA: cmp-view-offers-disclaimer. Find Offers
    29

    Sun

  • STL–SEA, 11/30/2026: From $370
    30

    Mon

  • STL–SEA, 12/01/2026: From $254
    01

    Tue

    DEC

  • STL–SEA, 12/02/2026: From $195
    02

    Wed

  • STL–SEA, 12/03/2026: From $221
    03

    Thu

  • STL–SEA, 12/04/2026: From $247
    04

    Fri

  • STL–SEA: cmp-view-offers-disclaimer. Find Offers
    05

    Sat

  • STL–SEA, 12/06/2026: From $249
    06

    Sun

  • STL–SEA, 12/07/2026: From $221
    07

    Mon

  • STL–SEA, 12/08/2026: From $195
    08

    Tue

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    09

    Wed

  • STL–SEA, 12/10/2026: From $221
    10

    Thu

  • STL–SEA, 12/11/2026: From $170
    11

    Fri

    • Range$170-$559

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Lambert-St Louis Int'l Airport
    Arriving at:
    Seattle/Tacoma International Airport
    Distance:
    1709 miles

    Questions we hear the most

    There are 151 weekly flights from St. Louis to Seattle/Tacoma on Southwest Airlines.
    To find the lowest fares by day and time to fly St. Louis to Seattle/Tacoma with Southwest, check out our Low Fare Calendar.
    You can rent a car at Seattle/Tacoma International Airport book yours with your flight.
    Yes! Flights from St. Louis to Seattle/Tacoma—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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