AirHint found the following cheapest return flights from Philadelphia (PHL) to Frankfurt (FRA) in October 2025 (see full year).

Return flights

06 Oct - 20 Oct	Condor
22 Oct - 01 Nov	Spirit Airlines
08 Oct - 23 Oct	Frontier Airlines
21 Oct - 31 Oct	Frontier Airlines
23 Oct - 30 Oct	Frontier Airlines
26 Oct - 15 Nov	Frontier Airlines
16 Oct - 30 Oct	Frontier Airlines
05 Oct - 08 Oct	Frontier Airlines
17 Oct - 19 Oct	Frontier Airlines
28 Oct - 04 Nov	Discover Airlines	direct
01 Oct - 28 Oct	Spirit Airlines
30 Oct - 06 Nov	Lufthansa	direct
22 Oct - 01 Nov	United	direct
14 Oct - 21 Oct	Lufthansa	direct
22 Oct - 29 Oct	Discover Airlines

Also check the deals for one-way flights from Philadelphia to Frankfurt in October.

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 Frankfurt in October from 509€

Return flights