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

Return flights

05 Oct - 10 Oct	Aer Lingus	direct
30 Oct - 06 Nov	Icelandair
03 Oct - 07 Oct	Icelandair
02 Oct - 09 Oct	Icelandair
07 Oct - 14 Oct	Icelandair
07 Oct - 15 Oct	Icelandair
14 Oct - 22 Oct	Icelandair
06 Oct - 15 Oct	Aer Lingus	direct
05 Oct - 15 Oct	Aer Lingus	direct
22 Oct - 29 Oct	Air France
08 Oct - 16 Oct	Delta
26 Oct - 03 Nov	Delta
28 Oct - 04 Nov	KLM
26 Oct - 02 Nov	British Airways
25 Oct - 01 Nov	Aer Lingus

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 316€

Return flights