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

One-Way flights

14 Oct	Icelandair
07 Oct	Icelandair
08 Oct	Frontier Airlines
20 Oct	Frontier Airlines
26 Oct	Icelandair
25 Oct	Frontier Airlines
08 Oct	Aer Lingus	direct
20 Oct	Aer Lingus	direct
25 Oct	Aer Lingus	direct
02 Oct	British Airways

Also check the deals for return 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 one-way flights from Denver to Dublin in October from 154€

One-Way flights