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

Return flights

05 Oct - 11 Oct	easyJet
30 Oct - 03 Nov	easyJet
06 Oct - 12 Oct	easyJet
26 Oct - 02 Nov	easyJet
22 Oct - 26 Oct	easyJet
12 Oct - 19 Oct	Jet2
19 Oct - 26 Oct	easyJet
23 Oct - 27 Oct	easyJet
03 Oct - 06 Oct	Fly Play	direct
12 Oct - 19 Oct	Icelandair	direct
26 Oct - 02 Nov	Icelandair	direct
19 Oct - 26 Oct	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Lisbon 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 Keflavik to Lisbon in October from 197€

Return flights