Flights from Seattle, WA to St. Louis, MO

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Best Deals on Flights From Seattle, WA (SEA) to St. Louis, MO (STL)

Nov 2026
from$514*
Last seen: 1 hour ago
One-way/Economy
Dec 2026
from$167*
Last seen: 13 hours ago
One-way/Economy
Jan 2027
from$108*
Last seen: 9 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $167
Displaying fares for November-2026
  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    13

    Fri

    NOV

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

    Sat

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    15

    Sun

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

    Mon

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    17

    Tue

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    18

    Wed

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    19

    Thu

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    20

    Fri

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    21

    Sat

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    22

    Sun

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

    Mon

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    24

    Tue

  • SEA–STL, Nov 25, 2026: from $514
    25

    Wed

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    26

    Thu

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    27

    Fri

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    28

    Sat

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

    Sun

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    30

    Mon

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    01

    Tue

    DEC

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    02

    Wed

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    03

    Thu

  • SEA–STL, Dec 4, 2026: from $167
    04

    Fri

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

    Sat

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    06

    Sun

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    07

    Mon

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    08

    Tue

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    09

    Wed

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    10

    Thu

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    11

    Fri

  • SEA–STL: cmp-view-offers-disclaimer. Find Offers
    12

    Sat

    • Range$167-$514

    *Prices found by others in the previous 48 hours for round-trip flights. Prices shown may also require membership in our travel club, Discount Den.

    Flights Deals from Seattle, WA to St. Louis, MO on Frontier

    $
    Flights Deals from Seattle, WA to St. Louis, MO on Frontier
    From
    To
    Seattle, WA (SEA)St. Louis, MO (STL)One-way
    /
    Discount Den Basic Fare    		Departing Jul 2, 2027

    From

    $243

    Last seen: 19 hours ago

    *Prices found by others in the previous 48 hours for one-way flights. Prices shown may also require membership in our travel club, Discount Den®.

    Seattle, WA St. Louis, MO

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