Alaska Airlines Flights from Seattle to Philadelphia

Lowest fares from Seattle to Philadelphia

Aug 2026
From$229*
Seen: 16 hours ago
Flight Type One Way|Saver
Sep 2026
From$210*
Seen: 16 hours ago
Flight Type One Way|Saver
Oct 2026
From$210*
Seen: 16 hours ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $210
cmp-daily-histogram-bars-legend-max-price-aria-label $784
Displaying fares for August-2026
  • SEA–PHL, Aug 9, 2026: From $784
    09

    Su

    AUG

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

    Mo

  • SEA–PHL, Aug 11, 2026: From $357
    11

    Tu

  • SEA–PHL, Aug 12, 2026: From $415
    12

    We

  • SEA–PHL, Aug 13, 2026: From $339
    13

    Th

  • SEA–PHL, Aug 14, 2026: From $355
    14

    Fr

  • SEA–PHL, Aug 15, 2026: From $339
    15

    Sa

  • SEA–PHL, Aug 16, 2026: From $514
    16

    Su

  • SEA–PHL, Aug 17, 2026: From $440
    17

    Mo

  • SEA–PHL, Aug 18, 2026: From $415
    18

    Tu

  • SEA–PHL, Aug 19, 2026: From $353
    19

    We

  • SEA–PHL, Aug 20, 2026: From $339
    20

    Th

  • SEA–PHL, Aug 21, 2026: From $353
    21

    Fr

  • SEA–PHL, Aug 22, 2026: From $414
    22

    Sa

  • SEA–PHL, Aug 23, 2026: From $324
    23

    Su

  • SEA–PHL, Aug 24, 2026: From $324
    24

    Mo

  • SEA–PHL, Aug 25, 2026: From $324
    25

    Tu

  • SEA–PHL, Aug 26, 2026: From $324
    26

    We

  • SEA–PHL, Aug 27, 2026: From $339
    27

    Th

  • SEA–PHL, Aug 28, 2026: From $324
    28

    Fr

  • SEA–PHL, Aug 29, 2026: From $244
    29

    Sa

  • SEA–PHL, Aug 30, 2026: From $229
    30

    Su

  • SEA–PHL, Aug 31, 2026: From $229
    31

    Mo

  • SEA–PHL, Sep 1, 2026: From $244
    01

    Tu

    SEP

  • SEA–PHL, Sep 2, 2026: From $229
    02

    We

  • SEA–PHL, Sep 3, 2026: From $229
    03

    Th

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

    Fr

  • SEA–PHL, Sep 5, 2026: From $244
    05

    Sa

  • SEA–PHL, Sep 6, 2026: From $286
    06

    Su

  • SEA–PHL, Sep 7, 2026: From $447
    07

    Mo

  • SEA–PHL, Sep 8, 2026: From $210
    08

    Tu

    • Range$210-$784

    *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 Seattle to Philadelphia.*

    $
    keyboard_arrow_down
    One-way low-fare flights Seattle to Philadelphia.*
    From
    To
    Fare Type
    Dates
    Price
    Seattle (SEA)Philadelphia (PHL)One-way
    |
    Saver    		Depart: Sep 10, 2026

    From

    $210

    Seen: 16 hours ago

    Seattle (SEA)Philadelphia (PHL)One-way
    |
    Saver    		Depart: Sep 17, 2026

    From

    $210

    Seen: 16 hours ago

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

    From

    $210

    Seen: 16 hours ago

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

    From

    $210

    Seen: 16 hours ago

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

    From

    $210

    Seen: 16 hours ago

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

    From

    $210

    Seen: 16 hours ago

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

    From

    $210

    Seen: 16 hours ago

    Seattle (SEA)Philadelphia (PHL)One-way
    |
    Saver    		Depart: Oct 2, 2026

    From

    $210

    Seen: 16 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.

    Explore Alaska Airlines's Flights to Top-Pick Destinations