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

Return flights

29 Oct - 05 Nov	United
15 Oct - 31 Oct	Air Canada
14 Oct - 23 Oct	Air Canada
22 Oct - 02 Nov	United
24 Oct - 31 Oct	United
10 Oct - 15 Oct	Air Canada
13 Oct - 19 Oct	Air Canada
19 Oct - 26 Oct	United
30 Oct - 17 Nov	Delta
02 Oct - 07 Oct	Air Canada
11 Oct - 16 Oct	jetBlue
10 Oct - 13 Oct	Delta
14 Oct - 19 Oct	Air Canada

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 407€

Return flights