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

Return flights

09 Dec - 16 Dec	Icelandair
31 Dec - 24 Jan	Icelandair
04 Dec - 11 Dec	Icelandair
02 Dec - 09 Dec	Aer Lingus	direct
09 Dec - 16 Dec	Aer Lingus	direct
07 Dec - 14 Dec	Lufthansa
28 Dec - 17 Jan	Lufthansa
27 Dec - 13 Jan	Lufthansa
03 Dec - 08 Dec	Lufthansa	direct
04 Dec - 11 Dec	United	direct
03 Dec - 07 Dec	Aer Lingus	direct
07 Dec - 14 Dec	United	direct
11 Dec - 18 Dec	Aer Lingus	direct
31 Dec - 24 Jan	Aer Lingus	direct
27 Dec - 13 Jan	Aer Lingus	direct
28 Dec - 17 Jan	Aer Lingus	direct
29 Dec - 09 Jan	United
24 Dec - 15 Jan	United
14 Dec - 11 Jan	Air Canada
14 Dec - 11 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 361€

Return flights