AirHint found the following cheapest one-way flights from Boston (BOS) to Frankfurt (FRA) in September 2026 (see full year).
One-Way flights
| 23 Sep | Air France | ||
| 22 Sep | Air France | ||
| 29 Sep | Air France | ||
| 23 Sep | Lufthansa | direct | |
| 29 Sep | Lufthansa | direct | |
| 22 Sep | United | direct |
Also check the deals for return flights from Boston to Frankfurt in September.
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