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

Return flights

21 Oct - 28 Oct	easyJet
31 Oct - 07 Nov	Fly Play	direct
29 Oct - 04 Nov	easyJet
07 Oct - 14 Oct	easyJet
20 Oct - 27 Oct	Vueling Airlines
01 Oct - 08 Oct	TAP
03 Oct - 05 Oct	Ryanair
31 Oct - 05 Nov	Fly Play
20 Oct - 30 Oct	Vueling Airlines
11 Oct - 18 Oct	easyJet
06 Oct - 08 Oct	Vueling Airlines
04 Oct - 14 Oct	Ryanair
31 Oct - 06 Nov	Fly Play
30 Oct - 03 Nov	easyJet
06 Oct - 10 Oct	Vueling Airlines
29 Oct - 02 Nov	easyJet
26 Oct - 02 Nov	easyJet
25 Oct - 01 Nov	easyJet
26 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 $196

Return flights