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

Return flights

04 Dec - 09 Dec	Iberia For Level
06 Dec - 09 Dec	Iberia For Level
11 Dec - 15 Dec	Iberia For Level
09 Dec - 14 Dec	Iberia For Level
05 Dec - 09 Dec	Icelandair
12 Dec - 16 Dec	Icelandair
13 Dec - 17 Dec	Icelandair
07 Dec - 20 Dec	Icelandair
04 Dec - 09 Dec	Aer Lingus	direct
09 Dec - 14 Dec	Aer Lingus	direct
20 Dec - 08 Jan	Icelandair
20 Dec - 10 Jan	Icelandair
20 Dec - 09 Jan	Icelandair
20 Dec - 11 Jan	Icelandair
21 Dec - 10 Jan	Icelandair
27 Dec - 10 Jan	Icelandair
26 Dec - 04 Jan	Icelandair
26 Dec - 03 Jan	Icelandair
20 Dec - 02 Jan	Icelandair
20 Dec - 04 Jan	Icelandair

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 $343

Return flights