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

Return flights

05 Dec - 11 Dec	TAP
10 Dec - 17 Dec	SWISS
11 Dec - 15 Dec	TAP
28 Dec - 20 Jan	Austrian Airlines
11 Dec - 25 Dec	TAP
01 Dec - 15 Dec	SWISS
09 Dec - 16 Dec	Lufthansa
10 Dec - 03 Jan	TAP
16 Dec - 10 Jan	TAP
26 Dec - 02 Jan	TAP
17 Dec - 10 Jan	Icelandair
21 Dec - 04 Jan	TAP
20 Dec - 10 Jan	TAP
17 Dec - 23 Dec	TAP
11 Dec - 23 Dec	Aer Lingus
14 Dec - 03 Jan	Icelandair
28 Dec - 10 Jan	Scandinavian Airlines
15 Dec - 31 Dec	Aer Lingus
17 Dec - 06 Jan	British Airways
18 Dec - 29 Dec	Spirit 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 $428

Return flights