Southwest® flights from Seattle/Tacoma to Philadelphia from $169

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Low fares from Seattle/Tacoma to Philadelphia

$

Seattle/Tacoma (SEA)to

Philadelphia (PHL)
Depart: 09/23/2026

One-way

Basic

From
$169
Seen: 7 hrs ago

Seattle/Tacoma (SEA)to

Philadelphia (PHL)
Depart: 09/22/2026

One-way

Basic

From
$169
Seen: 8 hrs ago

Seattle/Tacoma (SEA)to

Philadelphia (PHL)
Depart: 10/21/2026

One-way

Basic

From
$189
Seen: 23 hrs ago

Seattle/Tacoma (SEA)to

Philadelphia (PHL)
Depart: 10/04/2026

One-way

Basic

From
$190
Seen: 14 hrs ago

Seattle/Tacoma (SEA)to

Philadelphia (PHL)
Depart: 11/24/2026

One-way

Basic

From
$190
Seen: 8 hrs ago

Seattle/Tacoma (SEA)to

Philadelphia (PHL)
Depart: 09/12/2026

One-way

Basic

From
$194
Seen: 21 hrs ago

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Explore flights from Seattle/Tacoma to Philadelphia

Aug 2026
From$208*
Seen: 12 hrs ago
One Way/Basic
Sep 2026
From$169*
Seen: 7 hrs ago
One Way/Basic
Oct 2026
From$189*
Seen: 23 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $194
cmp-daily-histogram-bars-legend-max-price-aria-label $301
Displaying fares for August-2026
  • SEA–PHL, 08/22/2026: From $213
    22

    Sat

    AUG

  • SEA–PHL, 08/23/2026: From $301
    23

    Sun

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    24

    Mon

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    25

    Tue

  • SEA–PHL, 08/26/2026: From $208
    26

    Wed

  • SEA–PHL, 08/27/2026: From $281
    27

    Thu

  • SEA–PHL, 08/28/2026: From $281
    28

    Fri

  • SEA–PHL, 08/29/2026: From $208
    29

    Sat

  • SEA–PHL, 08/30/2026: From $281
    30

    Sun

  • SEA–PHL: cmp-view-offers-disclaimer. Find Offers
    31

    Mon

  • SEA–PHL, 09/01/2026: From $208
    01

    Tue

    SEP

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    02

    Wed

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    03

    Thu

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    04

    Fri

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    05

    Sat

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    06

    Sun

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    07

    Mon

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    08

    Tue

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    09

    Wed

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    10

    Thu

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    11

    Fri

  • SEA–PHL, 09/12/2026: From $194
    12

    Sat

  • SEA–PHL, 09/13/2026: From $250
    13

    Sun

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

    Mon

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    15

    Tue

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    16

    Wed

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    17

    Thu

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    18

    Fri

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    19

    Sat

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    20

    Sun

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

    Mon

    • Range$194-$301

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Seattle/Tacoma International Airport
    Arriving at:
    Philadelphia International Airport
    Distance:
    2378 miles

    Route Information

    62† Weekly flights

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    There are 62 weekly flights from Seattle/Tacoma to Philadelphia on Southwest Airlines.
    To find the lowest fares by day and time to fly Seattle/Tacoma to Philadelphia with Southwest, check out our Low Fare Calendar.
    You can rent a car at Philadelphia International Airport book yours with your flight.
    Yes! Flights from Seattle/Tacoma to Philadelphia—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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