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

Return flights

26 Oct - 04 Nov	United
28 Oct - 04 Nov	Aer Lingus	direct
26 Oct - 04 Nov	Aer Lingus	direct
29 Oct - 06 Nov	United
29 Oct - 02 Nov	Delta
29 Oct - 03 Nov	KLM
25 Oct - 15 Nov	Air Canada
31 Oct - 02 Nov	Aer Lingus	direct
24 Oct - 10 Nov	United
25 Oct - 01 Nov	Air France
22 Oct - 29 Oct	Aer Lingus	direct
22 Oct - 27 Oct	Aer Lingus
26 Oct - 27 Oct	Aer Lingus	direct
22 Oct - 27 Oct	Aer Lingus	direct
23 Oct - 26 Oct	Aer Lingus	direct

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

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 October from 414€

Return flights