Cheapest one-way flights from Phoenix to Seattle in April from $91

AirHint found the following cheapest one-way flights from Phoenix (PHX) to Seattle (SEA) in April 2026 (see full year).

One-Way flights

09 Apr Frontier Airlines
26 Apr Alaska Airlines direct
11 Apr Frontier Airlines
05 Apr Delta direct
02 Apr Frontier Airlines direct
04 Apr Frontier Airlines direct
06 Apr Frontier Airlines direct
03 Apr Frontier Airlines direct
11 Apr Southwest Airlines direct

Also check the deals for return flights from Phoenix to Seattle in April.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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