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

Return flights

20 Aug - 26 Aug	Icelandair
27 Aug - 03 Sep	Icelandair
20 Aug - 13 Sep	Icelandair
25 Aug - 03 Sep	Icelandair
31 Aug - 06 Sep	Icelandair
20 Aug - 27 Aug	Icelandair
30 Aug - 06 Sep	Icelandair
19 Aug - 26 Aug	Icelandair
28 Aug - 10 Sep	Icelandair
19 Aug - 25 Aug	Icelandair
28 Aug - 08 Sep	Icelandair
29 Aug - 06 Sep	Icelandair
27 Aug - 01 Sep	Icelandair
24 Aug - 28 Aug	Icelandair
19 Aug - 27 Aug	Icelandair
19 Aug - 13 Sep	Icelandair
21 Aug - 27 Aug	Icelandair
20 Aug - 27 Aug	Condor	direct
20 Aug - 26 Aug	Condor	direct
18 Aug - 21 Aug	Condor	direct

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

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 Boston to Frankfurt in August from 446€

Return flights