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

Return flights

07 Oct - 01 Nov	Icelandair
26 Oct - 03 Nov	Lufthansa
13 Oct - 22 Oct	KLM
13 Oct - 22 Oct	Aer Lingus	direct
08 Oct - 22 Oct	Delta
08 Oct - 24 Oct	Delta
07 Oct - 21 Oct	Delta
05 Oct - 15 Oct	Aer Lingus	direct
21 Oct - 11 Nov	United
13 Oct - 08 Nov	Iberia
20 Oct - 15 Nov	Iberia
01 Oct - 15 Oct	Air France
01 Oct - 16 Oct	Air France
15 Oct - 20 Oct	Lufthansa
29 Oct - 12 Nov	United
27 Oct - 22 Nov	United
06 Oct - 01 Nov	Iberia
15 Oct - 20 Oct	Aer Lingus	direct
17 Oct - 08 Nov	Iberia

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 368€

Return flights