Alaska Airlines Flights from Saint Louis to Seattle

Lowest fares from Saint Louis to Seattle

Aug 2026
From$214*
Seen: 1 hour ago
Flight Type One Way|Saver
Sep 2026
From$159*
Seen: 1 hour ago
Flight Type One Way|Saver
Oct 2026
From$159*
Seen: 1 hour ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $179
cmp-daily-histogram-bars-legend-max-price-aria-label $424
Displaying fares for August-2026
  • STL–SEA, Aug 10, 2026: From $424
    10

    Mo

    AUG

  • STL–SEA, Aug 11, 2026: From $311
    11

    Tu

  • STL–SEA, Aug 12, 2026: From $311
    12

    We

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

    Th

  • STL–SEA, Aug 14, 2026: From $424
    14

    Fr

  • STL–SEA, Aug 15, 2026: From $384
    15

    Sa

  • STL–SEA, Aug 16, 2026: From $424
    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 $344
    21

    Fr

  • STL–SEA, Aug 22, 2026: From $344
    22

    Sa

  • STL–SEA, Aug 23, 2026: From $344
    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 $279
    28

    Fr

  • STL–SEA, Aug 29, 2026: From $279
    29

    Sa

  • STL–SEA, Aug 30, 2026: From $279
    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 $205
    06

    Su

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

    Mo

  • STL–SEA, Sep 8, 2026: From $224
    08

    Tu

  • STL–SEA, Sep 9, 2026: From $179
    09

    We

    • Range$179-$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 11, 2026

    From

    $159

    Seen: 1 hour ago

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

    From

    $159

    Seen: 1 hour ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 21, 2026

    From

    $159

    Seen: 1 hour ago

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

    From

    $159

    Seen: 1 hour ago

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

    From

    $159

    Seen: 1 hour ago

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

    From

    $159

    Seen: 1 hour ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 17, 2026

    From

    $159

    Seen: 1 hour ago

    Saint Louis (STL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 22, 2026

    From

    $159

    Seen: 1 hour 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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