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

Return flights

23 Sep - 07 Oct	Air Canada
22 Sep - 03 Oct	United
25 Sep - 15 Oct	United
26 Sep - 15 Oct	United
19 Sep - 21 Sep	United
22 Sep - 29 Sep	Condor
26 Sep - 28 Sep	United
30 Sep - 05 Oct	United
27 Sep - 18 Oct	United
30 Sep - 04 Oct	Spirit Airlines
30 Sep - 25 Oct	Frontier Airlines
21 Sep - 28 Sep	Frontier Airlines
23 Sep - 18 Oct	Air Canada
26 Sep - 28 Sep	British Airways	direct
21 Sep - 11 Oct	Spirit Airlines
21 Sep - 28 Sep	British Airways	direct
22 Sep - 29 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 $548

Return flights