Alaska Airlines Flights from Saint Louis to Seattle

Lowest fares from Saint Louis to Seattle

Aug 2026
From$214*
Seen: 47 minutes ago
Flight Type One Way|Saver
Sep 2026
From$159*
Seen: 47 minutes ago
Flight Type One Way|Saver
Oct 2026
From$159*
Seen: 47 minutes ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $159
cmp-daily-histogram-bars-legend-max-price-aria-label $424
Displaying fares for August-2026
  • STL–SEA, Aug 8, 2026: From $424
    08

    Sa

    AUG

  • STL–SEA, Aug 9, 2026: From $424
    09

    Su

  • STL–SEA, Aug 10, 2026: From $424
    10

    Mo

  • STL–SEA, Aug 11, 2026: From $424
    11

    Tu

  • STL–SEA, Aug 12, 2026: From $424
    12

    We

  • STL–SEA, Aug 13, 2026: From $384
    13

    Th

  • STL–SEA, Aug 14, 2026: From $344
    14

    Fr

  • STL–SEA, Aug 15, 2026: From $344
    15

    Sa

  • STL–SEA, Aug 16, 2026: From $359
    16

    Su

  • STL–SEA, Aug 17, 2026: From $344
    17

    Mo

  • STL–SEA, Aug 18, 2026: From $344
    18

    Tu

  • STL–SEA, Aug 19, 2026: From $344
    19

    We

  • STL–SEA, Aug 20, 2026: From $344
    20

    Th

  • STL–SEA, Aug 21, 2026: From $279
    21

    Fr

  • STL–SEA, Aug 22, 2026: From $279
    22

    Sa

  • STL–SEA, Aug 23, 2026: From $299
    23

    Su

  • STL–SEA, Aug 24, 2026: From $279
    24

    Mo

  • STL–SEA, Aug 25, 2026: From $279
    25

    Tu

  • STL–SEA, Aug 26, 2026: From $279
    26

    We

  • STL–SEA, Aug 27, 2026: From $279
    27

    Th

  • STL–SEA, Aug 28, 2026: From $214
    28

    Fr

  • STL–SEA, Aug 29, 2026: From $214
    29

    Sa

  • STL–SEA, Aug 30, 2026: From $214
    30

    Su

  • STL–SEA, Aug 31, 2026: From $214
    31

    Mo

  • STL–SEA, Sep 1, 2026: From $214
    01

    Tu

    SEP

  • STL–SEA, Sep 2, 2026: From $214
    02

    We

  • STL–SEA, Sep 3, 2026: From $214
    03

    Th

  • STL–SEA, Sep 4, 2026: From $214
    04

    Fr

  • STL–SEA, Sep 5, 2026: From $205
    05

    Sa

  • STL–SEA, Sep 6, 2026: From $159
    06

    Su

  • STL–SEA, Sep 7, 2026: From $214
    07

    Mo

    • Range$159-$424

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

    One-way low-fare flights Saint Louis to Seattle.*

    $
    keyboard_arrow_down
    One-way low-fare flights Saint Louis to Seattle.*
    From
    To
    Fare Type
    Dates
    Price
    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 21, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 6, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 11, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 15, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 20, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 23, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 26, 2026

    From

    $159

    Seen: 47 minutes ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Oct 2, 2026

    From

    $159

    Seen: 47 minutes ago

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

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