AirHint found the following cheapest return flights from Philadelphia (PHL) to Frankfurt (FRA) in September 2026 (see full year).
Return flights
| 22 Sep - 06 Oct | Aer Lingus | ||
| 22 Sep - 06 Oct | Lufthansa | direct | |
| 25 Sep - 09 Oct | Air Canada | ||
| 25 Sep - 09 Oct | Lufthansa | direct |
Also check the deals for one-way flights from Philadelphia to Frankfurt in September.
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