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

Return flights

02 Dec - 09 Dec	Aer Lingus	direct
07 Dec - 14 Dec	United
07 Dec - 14 Dec	Aer Lingus	direct
12 Dec - 11 Jan	Icelandair
12 Dec - 19 Dec	United	direct
12 Dec - 11 Jan	Aer Lingus	direct
30 Dec - 06 Jan	Icelandair
30 Dec - 05 Jan	Air Canada
29 Dec - 05 Jan	Scandinavian Airlines
22 Dec - 29 Dec	Air Canada
30 Dec - 06 Jan	Aer Lingus	direct
25 Dec - 02 Jan	Air Canada
26 Dec - 02 Jan	TAP
27 Dec - 03 Jan	Scandinavian Airlines
17 Dec - 29 Dec	Lufthansa
22 Dec - 29 Dec	United	direct
29 Dec - 05 Jan	Aer Lingus	direct

Also check the deals for one-way flights from Washington 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 Washington to Dublin in December from $458

Return flights