Cheapest return flights from Boise to Phoenix in September from $102

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

Return flights

19 Sep - 06 Oct Allegiant Air direct
29 Sep - 06 Oct Allegiant Air direct
05 Sep - 07 Sep Southwest Airlines direct
19 Sep - 22 Sep Allegiant Air direct
19 Sep - 03 Oct Allegiant Air direct
29 Sep - 03 Oct Allegiant Air direct
19 Sep - 26 Sep Allegiant Air direct
22 Sep - 23 Sep Allegiant Air direct
15 Sep - 19 Sep Allegiant Air direct
15 Sep - 06 Oct Allegiant Air direct
15 Sep - 22 Sep Allegiant Air direct
15 Sep - 03 Oct Allegiant Air direct
15 Sep - 26 Sep Allegiant Air direct
19 Sep - 29 Sep Allegiant Air direct
19 Sep - 10 Oct Allegiant Air direct
29 Sep - 10 Oct Allegiant Air direct
15 Sep - 29 Sep Allegiant Air direct

Also check the deals for one-way flights from Boise 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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