Alaska Airlines Flights from Philadelphia to Seattle

Lowest fares from Philadelphia to Seattle

Aug 2026
From$224*
Seen: 7 hours ago
Flight Type One Way|Saver
Sep 2026
From$190*
Seen: 7 hours ago
Flight Type One Way|Saver
Oct 2026
From$190*
Seen: 7 hours ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $190
cmp-daily-histogram-bars-legend-max-price-aria-label $379
Displaying fares for August-2026
  • PHL–SEA, Aug 8, 2026: From $353
    08

    Sa

    AUG

  • PHL–SEA, Aug 9, 2026: From $379
    09

    Su

  • PHL–SEA, Aug 10, 2026: From $339
    10

    Mo

  • PHL–SEA, Aug 11, 2026: From $339
    11

    Tu

  • PHL–SEA, Aug 12, 2026: From $339
    12

    We

  • PHL–SEA, Aug 13, 2026: From $353
    13

    Th

  • PHL–SEA, Aug 14, 2026: From $339
    14

    Fr

  • PHL–SEA, Aug 15, 2026: From $362
    15

    Sa

  • PHL–SEA, Aug 16, 2026: From $339
    16

    Su

  • PHL–SEA, Aug 17, 2026: From $339
    17

    Mo

  • PHL–SEA, Aug 18, 2026: From $324
    18

    Tu

  • PHL–SEA, Aug 19, 2026: From $319
    19

    We

  • PHL–SEA, Aug 20, 2026: From $319
    20

    Th

  • PHL–SEA, Aug 21, 2026: From $319
    21

    Fr

  • PHL–SEA, Aug 22, 2026: From $319
    22

    Sa

  • PHL–SEA, Aug 23, 2026: From $339
    23

    Su

  • PHL–SEA, Aug 24, 2026: From $319
    24

    Mo

  • PHL–SEA, Aug 25, 2026: From $319
    25

    Tu

  • PHL–SEA, Aug 26, 2026: From $319
    26

    We

  • PHL–SEA, Aug 27, 2026: From $319
    27

    Th

  • PHL–SEA, Aug 28, 2026: From $224
    28

    Fr

  • PHL–SEA, Aug 29, 2026: From $224
    29

    Sa

  • PHL–SEA, Aug 30, 2026: From $224
    30

    Su

  • PHL–SEA, Aug 31, 2026: From $224
    31

    Mo

  • PHL–SEA, Sep 1, 2026: From $224
    01

    Tu

    SEP

  • PHL–SEA, Sep 2, 2026: From $224
    02

    We

  • PHL–SEA, Sep 3, 2026: From $254
    03

    Th

  • PHL–SEA, Sep 4, 2026: From $244
    04

    Fr

  • PHL–SEA, Sep 5, 2026: From $224
    05

    Sa

  • PHL–SEA, Sep 6, 2026: From $190
    06

    Su

  • PHL–SEA, Sep 7, 2026: From $210
    07

    Mo

    • Range$190-$379

    *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 Philadelphia to Seattle.*

    $
    keyboard_arrow_down
    One-way low-fare flights Philadelphia to Seattle.*
    From
    To
    Fare Type
    Dates
    Price
    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 11, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 12, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 15, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 21, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 23, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 24, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 29, 2026

    From

    $190

    Seen: 7 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 30, 2026

    From

    $190

    Seen: 7 hours 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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