AirHint found the following cheapest return flights from Philadelphia (PHL) to Frankfurt (FRA) in September 2026 (see full year).
Return flights
| 05 Sep - 12 Sep | Aer Lingus | ||
| 13 Sep - 27 Sep | Air Canada | ||
| 13 Sep - 27 Sep | Discover Airlines | direct | |
| 12 Sep - 26 Sep | Air Canada |
Also check the deals for one-way flights from Philadelphia to Frankfurt in September.
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