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

Return flights

26 Aug - 19 Sep	Icelandair
27 Aug - 11 Sep	Condor	direct
24 Aug - 01 Sep	Aer Lingus
21 Aug - 27 Aug	Icelandair
22 Aug - 29 Aug	Icelandair
21 Aug - 27 Aug	Condor	direct
19 Aug - 26 Aug	Condor	direct
29 Aug - 06 Sep	Condor	direct
22 Aug - 25 Aug	KLM
22 Aug - 29 Aug	Condor	direct
23 Aug - 30 Aug	Condor	direct
28 Aug - 02 Sep	Condor	direct
22 Aug - 25 Aug	Condor	direct
21 Aug - 24 Aug	Condor	direct
24 Aug - 01 Sep	Condor	direct
29 Aug - 01 Sep	Condor	direct
26 Aug - 19 Sep	Lufthansa	direct
25 Aug - 26 Aug	TAP

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 $479

Return flights