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

Return flights

14 Oct - 21 Oct	SWISS
13 Oct - 21 Oct	Lufthansa
09 Oct - 15 Oct	KLM
08 Oct - 15 Oct	KLM
08 Oct - 16 Oct	KLM
13 Oct - 16 Oct	KLM
23 Oct - 10 Nov	KLM
05 Oct - 15 Oct	KLM
23 Oct - 02 Nov	KLM
13 Oct - 17 Oct	KLM
06 Oct - 10 Oct	KLM
01 Oct - 09 Nov	KLM
08 Oct - 22 Oct	KLM
01 Oct - 02 Nov	KLM
29 Oct - 02 Nov	KLM
31 Oct - 07 Nov	KLM
30 Oct - 07 Nov	KLM
27 Oct - 02 Nov	KLM
30 Oct - 06 Nov	KLM
31 Oct - 10 Nov	KLM

Also check the deals for one-way flights from London 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 London to Keflavik in October from 215€

Return flights