Cheapest return FRA–BOS flights, September

AirHint found the following cheapest return flights from Frankfurt (FRA) to Boston (BOS) in September 2026 (see full year).

Return flights

04 Sep - 13 Sep Aer Lingus
04 Sep - 22 Sep Aer Lingus
02 Sep - 20 Sep Aer Lingus
03 Sep - 15 Sep Aer Lingus
16 Sep - 29 Sep Aer Lingus
17 Sep - 24 Sep Aer Lingus
22 Sep - 27 Sep Iberia
21 Sep - 30 Sep KLM
12 Sep - 26 Sep KLM
15 Sep - 21 Sep KLM
17 Sep - 01 Oct KLM
19 Sep - 03 Oct KLM
20 Sep - 04 Oct KLM
21 Sep - 05 Oct KLM
23 Sep - 07 Oct KLM
26 Sep - 10 Oct KLM
27 Sep - 11 Oct KLM
29 Sep - 13 Oct KLM
28 Sep - 12 Oct KLM
30 Sep - 14 Oct KLM

Also check the deals for one-way flights from Frankfurt to Boston in September.

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