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

Return flights

22 Sep - 03 Oct	United
27 Sep - 10 Oct	Air France
21 Sep - 30 Sep	Delta
18 Sep - 25 Sep	United
17 Sep - 21 Sep	United
19 Sep - 26 Sep	United
18 Sep - 30 Sep	United
27 Sep - 05 Oct	Frontier Airlines
30 Sep - 05 Oct	jetBlue
27 Sep - 18 Oct	Lufthansa
30 Sep - 25 Oct	Air Canada
20 Sep - 11 Oct	Aer Lingus
23 Sep - 28 Sep	jetBlue
24 Sep - 18 Oct	Frontier Airlines
18 Sep - 28 Sep	Condor
16 Sep - 20 Sep	Frontier Airlines
16 Sep - 11 Oct	Frontier Airlines
21 Sep - 30 Sep	British Airways	direct
22 Sep - 03 Oct	American Airlines	direct
23 Sep - 28 Sep	American Airlines	direct

Also check the deals for one-way flights from Philadelphia 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 Philadelphia to Rome in September from $556

Return flights