Cheapest return flights from Phoenix to Denver in May from $234

AirHint found the following cheapest return flights from Phoenix (PHX) to Denver (DEN) in May 2026 (see full year).

Return flights

20 May - 27 May Southwest Airlines direct
14 May - 21 May Southwest Airlines direct
03 May - 17 Jun United direct
15 May - 22 May Southwest Airlines direct
18 May - 25 May Southwest Airlines direct
17 May - 24 May Southwest Airlines direct

Also check the deals for one-way flights from Phoenix to Denver in May.

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