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

Return flights

16 Oct - 20 Oct	Scandinavian Airlines
04 Oct - 06 Oct	Fly Play	direct
30 Oct - 03 Nov	Scandinavian Airlines
04 Oct - 05 Oct	Fly Play	direct
22 Oct - 25 Oct	Scandinavian Airlines
15 Oct - 28 Oct	Aer Lingus
31 Oct - 05 Nov	Ryanair
12 Oct - 17 Oct	KLM
12 Oct - 15 Oct	KLM
13 Oct - 16 Oct	Ryanair
02 Oct - 06 Oct	Ryanair
27 Oct - 30 Oct	Scandinavian Airlines
28 Oct - 04 Nov	Ryanair
31 Oct - 03 Nov	Ryanair
24 Oct - 01 Nov	Scandinavian Airlines
24 Oct - 03 Nov	Scandinavian Airlines
31 Oct - 03 Nov	Icelandair	direct
29 Oct - 01 Nov	Ryanair
10 Oct - 02 Nov	Ryanair
27 Oct - 01 Nov	Ryanair

Also check the deals for one-way flights from Dublin to Keflavik 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 Dublin to Keflavik in October from 144€

Return flights