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

Return flights

05 Dec - 09 Dec	TAP
03 Dec - 08 Dec	Icelandair
12 Dec - 17 Dec	Icelandair
08 Dec - 15 Dec	Lufthansa
16 Dec - 30 Dec	Lufthansa
04 Dec - 11 Dec	Lufthansa
03 Dec - 10 Dec	Lufthansa
07 Dec - 14 Dec	Lufthansa
12 Dec - 03 Jan	Lufthansa
12 Dec - 05 Jan	Lufthansa
06 Dec - 15 Dec	Lufthansa
24 Dec - 31 Dec	British Airways
24 Dec - 04 Jan	SWISS
24 Dec - 01 Jan	SWISS
24 Dec - 03 Jan	SWISS
06 Dec - 06 Jan	Lufthansa
06 Dec - 06 Jan	Aer Lingus	direct
09 Dec - 05 Jan	Lufthansa
14 Dec - 03 Jan	Lufthansa
23 Dec - 04 Jan	Lufthansa

Also check the deals for one-way flights from Dublin to Boston 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 Dublin to Boston in December from 329€

Return flights