Flights from Philadelphia (PHL) to Seattle (SEA) on Alaska Airlines

Lowest fares from Philadelphia to Seattle

Nov 2026
From$339*
Seen: 18 hours ago
Flight Type One Way|Saver
Dec 2026
From$205*
Seen: 18 hours ago
Flight Type One Way|Saver
Jan 2027
From$205*
Seen: 18 hours ago
Flight Type One Way|Saver
cmp-daily-histogram-bars-legend-min-price-aria-label $205
cmp-daily-histogram-bars-legend-max-price-aria-label $739
Displaying fares for November-2026
  • PHL–SEA, Nov 11, 2026: From $339
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  • PHL–SEA, Nov 12, 2026: From $339
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  • PHL–SEA, Nov 13, 2026: From $339
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    Fr

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

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

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

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

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  • PHL–SEA, Nov 18, 2026: From $339
    18

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  • PHL–SEA, Nov 19, 2026: From $339
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  • PHL–SEA, Nov 20, 2026: From $339
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    Fr

  • PHL–SEA, Nov 21, 2026: From $339
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  • PHL–SEA, Nov 22, 2026: From $339
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  • PHL–SEA, Nov 23, 2026: From $339
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  • PHL–SEA, Nov 24, 2026: From $339
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  • PHL–SEA, Nov 25, 2026: From $339
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  • PHL–SEA, Nov 26, 2026: From $339
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  • PHL–SEA, Nov 27, 2026: From $739
    27

    Fr

  • PHL–SEA, Nov 28, 2026: From $570
    28

    Sa

  • PHL–SEA, Nov 29, 2026: From $570
    29

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  • PHL–SEA, Nov 30, 2026: From $448
    30

    Mo

  • PHL–SEA, Dec 1, 2026: From $339
    01

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    DEC

  • PHL–SEA, Dec 2, 2026: From $269
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  • PHL–SEA, Dec 3, 2026: From $269
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  • PHL–SEA, Dec 4, 2026: From $269
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  • PHL–SEA, Dec 5, 2026: From $269
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  • PHL–SEA, Dec 6, 2026: From $269
    06

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  • PHL–SEA, Dec 7, 2026: From $339
    07

    Mo

  • PHL–SEA, Dec 8, 2026: From $269
    08

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  • PHL–SEA, Dec 9, 2026: From $269
    09

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  • PHL–SEA, Dec 10, 2026: From $205
    10

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    • Range$205-$739

    *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: Jan 16, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Jan 21, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Feb 8, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Feb 11, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Feb 26, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Mar 2, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Apr 14, 2027

    From

    $205

    Seen: 18 hours ago

    Philadelphia (PHL)Seattle (SEA)One-way
    |
    Saver    		Depart: Apr 20, 2027

    From

    $205

    Seen: 18 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.

    Frequently Asked Questions on flights from Philadelphia (PHL) to Seattle (SEA)

    When is the best time to book a flight from Philadelphia to Seattle?

    Want to find the lowest fares by day and time flying from Philadelphia to Seattle on Alaska Airlines or Hawaiian Airlines? Check out our flight search widget.

    Can I earn points on my flight to Seattle?

    Yes, with Atmosâ„¢ Rewards you can earn points on flights to 1000+ destinations worldwide through the growing network of Alaska and Hawaiian Airlines. Not an Atmosâ„¢ Rewards member yet? Learn more and join today.

    Can I rent a car when I arrive at Seattle/Tacoma International Airport?

    Yes, you can rent a car at Seattle/Tacoma International Airport. Check availability and book now

    Where can I find the status of my flight to Seattle?

    You can check the status of your upcoming Alaska Airlines flight on our flight schedule page.

    Where can I find answers to questions about flying with Alaska Airlines?

    Visit the Alaska Airlines Help Center to quickly browse our help pages by category to find the information you need.

    Can I change or cancel my Alaska Airlines flight to Seattle?

    Yes, you can review, modify, or cancel a reservation from our Manage Your Reservation tool. You can learn more about our policy for changing or cancelling a reservation here. 

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