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

Return flights

05 Dec - 07 Dec	TAP
10 Dec - 24 Dec	Icelandair
29 Dec - 12 Jan	Icelandair
06 Dec - 13 Dec	TAP
05 Dec - 14 Dec	TAP
06 Dec - 12 Dec	TAP
06 Dec - 14 Dec	TAP
05 Dec - 13 Dec	TAP
07 Dec - 14 Dec	TAP
07 Dec - 12 Dec	Icelandair
04 Dec - 11 Dec	Icelandair
28 Dec - 17 Jan	TAP
26 Dec - 17 Jan	Condor
16 Dec - 12 Jan	Icelandair
17 Dec - 10 Jan	Icelandair
16 Dec - 15 Jan	Spirit Airlines
16 Dec - 17 Jan	Spirit Airlines
16 Dec - 16 Jan	Spirit Airlines
16 Dec - 18 Jan	Icelandair
16 Dec - 13 Jan	Spirit Airlines

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 380€

Return flights