Seattle / Tacoma (SEA) to Philadelphia (PHL) flight deal in economy from $329

Sunday, December 20th, 2026

10 round-trip options

Returning
Fri, Dec 25, 20265 Day Trip
$329 USD
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Sat, Dec 26, 20266 Day Trip
$737 USD
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Sun, Dec 27, 20267 Day Trip
$713 USD
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Mon, Dec 28, 20268 Day Trip
$750 USD
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Tue, Dec 29, 20269 Day Trip
$739 USD
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Wed, Dec 30, 202610 Day Trip
$793 USD
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Thu, Dec 31, 202611 Day Trip
$412 USD
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Fri, Jan 1, 202712 Day Trip
$472 USD
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Sat, Jan 2, 202713 Day Trip
$670 USD
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Sun, Jan 3, 202714 Day Trip
$692 USD