AirHint found the following cheapest return flights from Washington (IAD) to Dublin (DUB) in January 2026 (see full year).

Return flights

09 Jan - 23 Jan	Icelandair
26 Jan - 21 Feb	Icelandair
17 Jan - 24 Jan	Icelandair
25 Jan - 01 Feb	Icelandair
11 Jan - 18 Jan	Icelandair
16 Jan - 23 Jan	Icelandair
26 Jan - 02 Feb	Icelandair
12 Jan - 07 Feb	Icelandair
16 Jan - 07 Feb	Icelandair
21 Jan - 28 Jan	Aer Lingus	direct
05 Jan - 31 Jan	Icelandair
06 Jan - 13 Jan	Aer Lingus	direct
11 Jan - 18 Jan	Aer Lingus	direct
16 Jan - 23 Jan	Aer Lingus	direct
05 Jan - 31 Jan	Aer Lingus	direct
26 Jan - 02 Feb	Aer Lingus	direct
12 Jan - 07 Feb	Aer Lingus	direct
26 Jan - 21 Feb	Aer Lingus	direct
16 Jan - 07 Feb	Aer Lingus	direct

Also check the deals for one-way flights from Washington to Dublin in January.

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 January from $356

Return flights