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

Return flights

31 Oct - 03 Nov	Fly Play	direct
21 Oct - 28 Oct	easyJet
17 Oct - 27 Oct	Fly Play	direct
21 Oct - 29 Oct	easyJet
06 Oct - 13 Oct	Fly Play	direct
29 Oct - 03 Nov	easyJet
20 Oct - 27 Oct	Vueling Airlines
10 Oct - 13 Oct	Fly Play	direct
24 Oct - 28 Oct	Vueling Airlines
27 Oct - 31 Oct	easyJet
22 Oct - 28 Oct	easyJet
08 Oct - 15 Oct	KLM
31 Oct - 05 Nov	Fly Play
22 Oct - 01 Nov	easyJet
23 Oct - 02 Nov	Ryanair
23 Oct - 02 Nov	Icelandair	direct

Also check the deals for one-way flights from Lisbon 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 Lisbon to Keflavik in October from 169€

Return flights