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

Return flights

01 Oct - 12 Oct	easyJet	direct
22 Oct - 28 Oct	easyJet
31 Oct - 03 Nov	easyJet	direct
12 Oct - 19 Oct	easyJet	direct
10 Oct - 12 Oct	Icelandair
03 Oct - 06 Oct	Fly Play
10 Oct - 15 Oct	Icelandair
24 Oct - 26 Oct	easyJet
22 Oct - 28 Oct	easyJet	direct
26 Oct - 26 Oct	easyJet
24 Oct - 25 Oct	easyJet

Also check the deals for one-way flights from Keflavik to London 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 London in October from $124

Return flights