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

Return flights

04 Dec - 15 Dec	Icelandair
02 Dec - 09 Dec	Icelandair
04 Dec - 11 Dec	Icelandair
06 Dec - 13 Dec	Icelandair
08 Dec - 15 Dec	Icelandair
10 Dec - 17 Dec	TAP
13 Dec - 19 Dec	TAP
03 Dec - 17 Dec	TAP
24 Dec - 09 Jan	Icelandair
13 Dec - 22 Dec	Icelandair
12 Dec - 22 Dec	Icelandair
29 Dec - 24 Jan	Icelandair
27 Dec - 17 Jan	Icelandair
27 Dec - 09 Jan	Icelandair
15 Dec - 10 Jan	Aer Lingus
29 Dec - 24 Jan	Lufthansa	direct
24 Dec - 09 Jan	Lufthansa	direct
31 Dec - 07 Jan	Icelandair
17 Dec - 08 Jan	Aer Lingus
22 Dec - 17 Jan	jetBlue

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 437€

Return flights