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

Return flights

01 Dec - 08 Dec	Icelandair
30 Dec - 13 Jan	Aer Lingus
03 Dec - 17 Dec	Icelandair
11 Dec - 18 Dec	Icelandair
30 Dec - 13 Jan	Lufthansa	direct
01 Dec - 08 Dec	Lufthansa	direct
11 Dec - 18 Dec	Lufthansa	direct
31 Dec - 07 Jan	Lufthansa	direct
21 Dec - 28 Dec	United

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

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 December from 433€

Return flights