AirHint found the following cheapest one-way flights from Boston (BOS) to Frankfurt (FRA) in May 2026 (see full year).
One-Way flights
| 02 May | TAP | ||
| 22 May | Aer Lingus | ||
| 21 May | Condor | direct | |
| 28 May | Aer Lingus | ||
| 28 May | Condor | direct | |
| 02 May | United | direct |
Also check the deals for return flights from Boston to Frankfurt in May.
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