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

Return flights

03 Dec - 07 Dec	Air Canada
27 Dec - 11 Jan	Air Canada
05 Dec - 08 Dec	United
01 Dec - 07 Dec	United
28 Dec - 11 Jan	Aer Lingus	direct
12 Dec - 18 Dec	Aer Lingus	direct
01 Dec - 08 Dec	United
08 Dec - 15 Dec	United
03 Dec - 10 Dec	United
09 Dec - 17 Dec	SWISS
29 Dec - 24 Jan	United
06 Dec - 09 Dec	Aer Lingus	direct
06 Dec - 13 Dec	Aer Lingus	direct
28 Dec - 10 Jan	Aer Lingus	direct
31 Dec - 09 Jan	Aer Lingus	direct
25 Dec - 17 Jan	Air Canada
31 Dec - 07 Jan	Aer Lingus	direct
27 Dec - 11 Jan	Aer Lingus	direct
27 Dec - 23 Jan	Aer Lingus	direct
16 Dec - 09 Jan	Air Canada

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 285€

Return flights