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

Return flights

14 Sep - 22 Sep	Air Canada
08 Sep - 04 Oct	Frontier Airlines
20 Sep - 25 Sep	Frontier Airlines
22 Sep - 26 Sep	Frontier Airlines
20 Sep - 26 Sep	Frontier Airlines
17 Sep - 23 Sep	United
05 Sep - 08 Sep	Frontier Airlines
30 Sep - 07 Oct	United
27 Sep - 18 Oct	Frontier Airlines
19 Sep - 26 Sep	Frontier Airlines
19 Sep - 27 Sep	Frontier Airlines
06 Sep - 13 Sep	Frontier Airlines
18 Sep - 27 Sep	Frontier Airlines
26 Sep - 03 Oct	United
28 Sep - 05 Oct	United

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

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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Cheapest return flights from Phoenix to Rome in September from $703

Return flights