Philadelphia (PHL) to Seattle / Tacoma (SEA) cheap flight deal from $257 USD in economy class

ASAlaska Airlines, Inc.

Round Trip•Economy

PHL

Philadelphia International Airport

Philadelphia, United States

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$426 USD

-40%$257 USD

Verified Sep 22, 2025 at 4:07 AM

October 2025

Today

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29$567 30$567 1$567 2$567 3$567 4$547 5$592 6$517 7$447 8$447 9$447 10$467 11$447 12$357 13$552 14$257 15$257 16$257 17$257 18$257 19$357 20$307 21$257 22$257 23$257 24$257 25$257 26$257 27$307 28$257 29$257 30$257 31$257 1 2

Limited Availability

18% of dates checked are available within 10% of the lowest price

Sunday, October 5th, 2025

10 round-trip options

Returning

Fri, Oct 10, 2025•5 Day Trip

$742 USD

Google Flights

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Sat, Oct 11, 2025•6 Day Trip

$702 USD

Google Flights

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Sun, Oct 12, 2025•7 Day Trip

$722 USD

Google Flights

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Mon, Oct 13, 2025•8 Day Trip

$612 USD

Google Flights

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Tue, Oct 14, 2025•9 Day Trip

$642 USD

Google Flights

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Wed, Oct 15, 2025•10 Day Trip

$772 USD

Google Flights

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Thu, Oct 16, 2025•11 Day Trip

$772 USD

Google Flights

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Fri, Oct 17, 2025•12 Day Trip

$692 USD

Google Flights

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Sat, Oct 18, 2025•13 Day Trip

$592 USD

Google Flights

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Sun, Oct 19, 2025•14 Day Trip

$592 USD

Google Flights