Cheapest return flights from Seattle to Phoenix in September from 93€

AirHint found the following cheapest return flights from Seattle (SEA) to Phoenix (PHX) in September 2025 (see full year).

Return flights

29 Sep - 06 Oct Frontier Airlines direct
18 Sep - 21 Sep Frontier Airlines direct
24 Sep - 28 Sep Alaska Airlines direct
17 Sep - 28 Sep Alaska Airlines direct
20 Sep - 25 Sep Frontier Airlines
15 Sep - 25 Sep Frontier Airlines
20 Sep - 25 Sep Hawaiian Airlines direct
20 Sep - 24 Sep Hawaiian Airlines direct
12 Sep - 14 Sep Southwest Airlines direct

Also check the deals for one-way flights from Seattle to Phoenix in September.

Skyscanner

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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