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

Return flights

11 Dec - 31 Dec	Icelandair
24 Dec - 10 Jan	Aer Lingus	direct
12 Dec - 15 Jan	Scandinavian Airlines
24 Dec - 31 Dec	Aer Lingus	direct
12 Dec - 14 Jan	Finnair
26 Dec - 08 Jan	Finnair
12 Dec - 14 Dec	KLM	direct
26 Dec - 30 Dec	Iberia
17 Dec - 29 Jan	Lufthansa
10 Dec - 15 Jan	Aer Lingus	direct
24 Dec - 08 Jan	Aer Lingus	direct
23 Dec - 07 Jan	KLM
23 Dec - 31 Dec	Lufthansa
26 Dec - 31 Dec	Lufthansa
26 Dec - 01 Jan	Lufthansa
22 Dec - 01 Jan	SWISS
22 Dec - 30 Dec	SWISS
23 Dec - 30 Dec	Lufthansa
22 Dec - 30 Dec	KLM	direct
24 Dec - 28 Dec	KLM

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 443€

Return flights