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

Return flights

08 Dec - 15 Dec	United
03 Dec - 10 Dec	United
13 Dec - 20 Dec	United
09 Dec - 16 Dec	Aer Lingus	direct
02 Dec - 09 Dec	Aer Lingus	direct
10 Dec - 17 Dec	Aer Lingus	direct
03 Dec - 10 Dec	Aer Lingus	direct
11 Dec - 21 Dec	SWISS
07 Dec - 10 Dec	Aer Lingus	direct
08 Dec - 11 Dec	Aer Lingus	direct
25 Dec - 03 Jan	Icelandair
26 Dec - 03 Jan	Icelandair
25 Dec - 04 Jan	Icelandair
30 Dec - 03 Jan	Icelandair
30 Dec - 04 Jan	Icelandair
22 Dec - 05 Jan	United
23 Dec - 05 Jan	Delta	direct
23 Dec - 02 Jan	Delta	direct
29 Dec - 01 Jan	Aer Lingus
30 Dec - 02 Jan	Aer Lingus

Also check the deals for one-way flights from Boston to Dublin 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 Dublin in December from 296€

Return flights