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

Return flights

10 Dec - 17 Dec	SWISS
05 Dec - 11 Dec	TAP
11 Dec - 15 Dec	TAP
09 Dec - 16 Dec	Lufthansa
01 Dec - 15 Dec	SWISS
11 Dec - 25 Dec	TAP
28 Dec - 20 Jan	Lufthansa
17 Dec - 10 Jan	Icelandair
15 Dec - 10 Jan	Aer Lingus
11 Dec - 23 Dec	Aer Lingus
16 Dec - 10 Jan	TAP
17 Dec - 23 Dec	Lufthansa
10 Dec - 03 Jan	Icelandair
20 Dec - 10 Jan	Aer Lingus
28 Dec - 10 Jan	Lufthansa
14 Dec - 03 Jan	Icelandair
17 Dec - 06 Jan	Aer Lingus
22 Dec - 31 Dec	jetBlue
18 Dec - 29 Dec	Spirit Airlines
12 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Boston to Berlin 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 Berlin in December from 389€

Return flights