AirHint found the following cheapest return flights from Frankfurt (FRA) to Boston (BOS) in September 2025 (see full year).

Return flights

12 Sep - 21 Sep	Condor	direct
18 Sep - 28 Sep	Condor	direct
18 Sep - 30 Sep	Condor	direct
11 Sep - 23 Sep	Condor	direct
11 Sep - 14 Sep	Condor	direct
12 Sep - 28 Sep	Condor	direct
16 Sep - 12 Oct	Condor	direct
25 Sep - 13 Oct	Condor	direct
25 Sep - 09 Oct	Condor	direct
19 Sep - 22 Sep	Condor
17 Sep - 30 Sep	Condor
22 Sep - 30 Sep	Condor	direct
11 Sep - 24 Sep	Condor
15 Sep - 02 Oct	Condor
16 Sep - 02 Oct	Condor
20 Sep - 03 Oct	Icelandair
28 Sep - 05 Oct	Icelandair
30 Sep - 06 Oct	Condor	direct
08 Sep - 17 Oct	Icelandair
28 Sep - 03 Oct	Icelandair

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

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Frankfurt to Boston in September from 388€

Return flights