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

Return flights

16 Sep - 23 Sep	jetBlue
10 Sep - 17 Sep	Frontier Airlines
22 Sep - 03 Oct	TAP
30 Sep - 05 Oct	TAP
17 Sep - 24 Sep	Air Canada
09 Sep - 16 Sep	Frontier Airlines
15 Sep - 26 Sep	TAP
13 Sep - 27 Sep	TAP
02 Sep - 07 Sep	TAP
11 Sep - 14 Sep	TAP
27 Sep - 11 Oct	TAP
03 Sep - 10 Sep	United
16 Sep - 23 Sep	British Airways	direct
22 Sep - 03 Oct	American Airlines	direct
29 Sep - 06 Oct	United
26 Sep - 03 Oct	United
27 Sep - 11 Oct	American Airlines	direct
30 Sep - 05 Oct	Finnair	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 $578

Return flights