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

Return flights

03 Dec - 10 Dec	Icelandair
08 Dec - 15 Dec	Icelandair
26 Dec - 09 Jan	KLM
28 Dec - 17 Jan	TAP
13 Dec - 20 Dec	Icelandair
12 Dec - 10 Jan	Icelandair
14 Dec - 21 Dec	TAP
13 Dec - 27 Dec	TAP
16 Dec - 30 Dec	Aer Lingus
18 Dec - 23 Dec	TAP
18 Dec - 06 Jan	Icelandair
24 Dec - 03 Jan	British Airways
23 Dec - 30 Dec	Austrian Airlines
18 Dec - 05 Jan	Icelandair
16 Dec - 30 Dec	Lufthansa	direct
19 Dec - 06 Jan	Icelandair
18 Dec - 25 Dec	Icelandair
19 Dec - 05 Jan	Virgin Atlantic
28 Dec - 04 Jan	Lufthansa
24 Dec - 03 Jan	Lufthansa	direct

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