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

Return flights

28 Oct - 04 Nov	Air Canada
27 Oct - 03 Nov	Icelandair
30 Oct - 06 Nov	Icelandair
31 Oct - 07 Nov	Icelandair
22 Oct - 04 Nov	Air Canada
24 Oct - 31 Oct	Icelandair
22 Oct - 29 Oct	Air Canada
01 Oct - 08 Oct	Icelandair
08 Oct - 15 Oct	Air Canada
14 Oct - 21 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
21 Oct - 11 Nov	Delta
29 Oct - 05 Nov	Air Canada
15 Oct - 21 Oct	Air Canada
07 Oct - 14 Oct	Icelandair
27 Oct - 10 Nov	Icelandair
30 Oct - 13 Nov	Icelandair
21 Oct - 28 Oct	Air Canada
20 Oct - 27 Oct	Air Canada
23 Oct - 02 Nov	Icelandair

Also check the deals for one-way flights from Denver 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 Denver to Dublin in October from 299€

Return flights