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

Return flights

17 Oct - 20 Oct	Fly Play	direct
17 Oct - 27 Oct	Fly Play	direct
31 Oct - 03 Nov	Fly Play	direct
24 Oct - 27 Oct	Fly Play	direct
31 Oct - 07 Nov	easyJet
10 Oct - 13 Oct	Fly Play	direct
31 Oct - 08 Nov	easyJet
31 Oct - 06 Nov	easyJet
03 Oct - 06 Oct	Fly Play	direct
31 Oct - 07 Nov	Fly Play	direct
13 Oct - 20 Oct	Fly Play	direct
24 Oct - 31 Oct	Fly Play	direct
17 Oct - 24 Oct	Fly Play	direct
06 Oct - 13 Oct	Fly Play	direct
31 Oct - 05 Nov	easyJet
30 Oct - 05 Nov	Ryanair
07 Oct - 14 Oct	Ryanair
30 Oct - 02 Nov	easyJet
28 Oct - 04 Nov	easyJet
24 Oct - 02 Nov	Vueling Airlines

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 $163

Return flights