Earn point on your loyalty program!arrow arc left

Cheap flights from Phoenix (PHX) 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 Phoenix (PHX) to Seattle (BFI)

How to find the cheapest flight from Phoenix (PHX) 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 Phoenix (PHX) 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 Phoenix (PHX) 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 Phoenix to Seattle in January , February 2026

18 Jan - 22 Feb $ 823.00
PHX
Phoenix
Allegiant Air
1 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
1 STOPS
PHX
Phoenix
Pick dates
18 Jan - 26 Feb $ 835.00
PHX
Phoenix
Allegiant Air
1 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
1 STOPS
PHX
Phoenix
Pick dates
15 Jan - 26 Feb $ 853.00
PHX
Phoenix
Allegiant Air
1 STOPS
BFI
Seattle
BFI
Seattle
Allegiant Air
1 STOPS
PHX
Phoenix
Pick dates

Last minute flights from Phoenix to Seattle

18 Jan - 02 Feb $ 884.00
PHX
Phoenix
Frontier Airlines
1 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
PHX
Phoenix
Pick dates
18 Jan - 01 Feb $ 956.00
PHX
Phoenix
Frontier Airlines
1 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
PHX
Phoenix
Pick dates
18 Jan - 01 Feb $ 967.00
PHX
Phoenix
Frontier Airlines
1 STOPS
BFI
Seattle
BFI
Seattle
Frontier Airlines
2 STOPS
PHX
Phoenix
Pick dates

One-way flights to Seattle from Phoenix

8:36 PM - 2:45 PM
Air Excursions
2 Stops
19h 59m
PHX - BFI
$ 406
Kiwi
Pick dates
5:25 AM - 10:15 AM
Air Excursions
1 Stops
6h 40m
PHX - BFI
$ 455
Kiwi
Pick dates
7:25 AM - 2:45 PM
Air Excursions
1 Stops
9h 10m
PHX - BFI
$ 473
Kiwi
Pick dates

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