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

Return flights

30 Oct - 12 Nov	Wizz Air
30 Oct - 07 Nov	Ryanair
22 Oct - 26 Oct	easyJet
30 Oct - 06 Nov	Ryanair
31 Oct - 12 Nov	Ryanair
30 Oct - 09 Nov	Ryanair
29 Oct - 11 Nov	easyJet
30 Oct - 16 Nov	Ryanair
19 Oct - 26 Oct	Ryanair
30 Oct - 05 Nov	Ryanair
31 Oct - 10 Nov	Ryanair
23 Oct - 01 Nov	easyJet
23 Oct - 28 Oct	Ryanair
21 Oct - 25 Oct	Ryanair
20 Oct - 23 Oct	Ryanair
22 Oct - 29 Oct	easyJet
19 Oct - 25 Oct	Ryanair
23 Oct - 26 Oct	easyJet
24 Oct - 27 Oct	TAP
15 Oct - 22 Oct	Ryanair

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 288€

Return flights