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

Return flights

08 Sep - 16 Sep	Spirit Airlines
04 Sep - 09 Sep	Spirit Airlines
01 Sep - 07 Sep	Frontier Airlines
27 Sep - 08 Oct	Spirit Airlines
12 Sep - 19 Sep	Aer Lingus
05 Sep - 09 Sep	Aer Lingus
05 Sep - 12 Sep	Aer Lingus
10 Sep - 08 Oct	Aer Lingus
09 Sep - 17 Sep	Frontier Airlines
03 Sep - 07 Sep	Aer Lingus
20 Sep - 27 Sep	Air France
18 Sep - 22 Sep	Air France
10 Sep - 08 Oct	Iberia	direct
30 Sep - 04 Oct	Aer Lingus
29 Sep - 06 Oct	Air France
26 Sep - 03 Oct	Air France
27 Sep - 08 Oct	Iberia	direct
30 Sep - 04 Oct	Finnair	direct

Also check the deals for one-way flights from Philadelphia to Paris 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 Paris in September from $636

Return flights