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

Return flights

04 Dec - 11 Dec	Icelandair
01 Dec - 05 Dec	Icelandair
01 Dec - 14 Dec	Icelandair
05 Dec - 12 Dec	TAP
04 Dec - 10 Dec	Icelandair
05 Dec - 10 Dec	Icelandair
02 Dec - 10 Dec	Icelandair
02 Dec - 10 Dec	Aer Lingus	direct
03 Dec - 10 Dec	Aer Lingus	direct
09 Dec - 16 Dec	Aer Lingus	direct
31 Dec - 24 Jan	Icelandair
28 Dec - 17 Jan	United
29 Dec - 08 Jan	SWISS
31 Dec - 24 Jan	Aer Lingus	direct
28 Dec - 17 Jan	Aer Lingus	direct
25 Dec - 08 Jan	British Airways
27 Dec - 13 Jan	Aer Lingus	direct
27 Dec - 17 Jan	United
24 Dec - 11 Jan	Air Canada
09 Dec - 06 Jan	Icelandair

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 336€

Return flights