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

Return flights

24 Oct - 31 Oct	Icelandair
22 Oct - 05 Nov	Air Canada
07 Oct - 21 Oct	Air Canada
15 Oct - 22 Oct	Air Canada
15 Oct - 22 Oct	Aer Lingus	direct
13 Oct - 22 Oct	KLM
13 Oct - 22 Oct	Aer Lingus	direct
29 Oct - 12 Nov	United
27 Oct - 22 Nov	Air Canada
07 Oct - 14 Oct	Delta
08 Oct - 22 Oct	Air Canada
08 Oct - 24 Oct	Air Canada
13 Oct - 08 Nov	Air Canada
06 Oct - 01 Nov	Air Canada
20 Oct - 15 Nov	Air Canada
28 Oct - 22 Nov	Air Canada
21 Oct - 11 Nov	United
17 Oct - 27 Oct	Air Canada
29 Oct - 01 Nov	Frontier Airlines
17 Oct - 08 Nov	Air Canada

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 $433

Return flights