Earn point on your loyalty program!arrow arc left

Cheap flights from Philadelphia (PHL) to Seattle (BFI)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)

How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from Philadelphia to Seattle in January , February 2026

28 Jan - 28 Feb $ 903.00
PHL
Philadelphia
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
PHL
Philadelphia
Pick dates
28 Jan - 28 Feb $ 913.00
PHL
Philadelphia
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
PHL
Philadelphia
Pick dates
28 Jan - 28 Feb $ 918.00
PHL
Philadelphia
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
PHL
Philadelphia
Pick dates

Last minute flights from Philadelphia to Seattle

28 Jan - 02 Feb $ 931.00
PHL
Philadelphia
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
PHL
Philadelphia
Pick dates
28 Jan - 02 Feb $ 941.00
PHL
Philadelphia
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
PHL
Philadelphia
Pick dates
28 Jan - 02 Feb $ 945.00
PHL
Philadelphia
Frontier Airlines
3 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
3 STOPS
PHL
Philadelphia
Pick dates

One-way flights to Seattle from Philadelphia

12:39 PM - 2:45 PM
Air Excursions
3 Stops
29h 56m
PHL - BFI
$ 439
Kiwi
Pick dates
1:40 PM - 2:45 PM
Air Excursions
3 Stops
28h 55m
PHL - BFI
$ 449
Kiwi
Pick dates
2:36 PM - 2:45 PM
Air Excursions
3 Stops
27h 59m
PHL - BFI
$ 453
Kiwi
Pick dates

How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Philadelphia (PHL) to Seattle (BFI)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.