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

Return flights

03 Dec - 10 Dec	Icelandair
06 Dec - 13 Dec	Icelandair
10 Dec - 14 Dec	Icelandair
03 Dec - 07 Dec	TAP
03 Dec - 10 Dec	Aer Lingus	direct
09 Dec - 16 Dec	Aer Lingus	direct
29 Dec - 24 Jan	Icelandair
27 Dec - 13 Jan	Lufthansa
30 Dec - 13 Jan	British Airways
10 Dec - 14 Dec	Aer Lingus	direct
03 Dec - 07 Dec	Aer Lingus	direct
27 Dec - 13 Jan	Aer Lingus	direct
29 Dec - 24 Jan	Aer Lingus	direct
16 Dec - 23 Dec	United	direct
16 Dec - 13 Jan	United
15 Dec - 19 Jan	Air France
13 Dec - 20 Dec	United	direct
16 Dec - 08 Jan	SWISS
16 Dec - 13 Jan	Aer Lingus	direct
15 Dec - 19 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 339€

Return flights