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

Return flights

23 Oct - 27 Oct	ITA Airways
02 Oct - 05 Oct	KLM
02 Oct - 08 Oct	KLM
08 Oct - 13 Oct	Lufthansa
06 Oct - 23 Nov	KLM
08 Oct - 12 Oct	KLM
06 Oct - 12 Oct	KLM
09 Oct - 12 Oct	KLM
01 Oct - 06 Oct	KLM
15 Oct - 19 Oct	Lufthansa
07 Oct - 14 Oct	SWISS
31 Oct - 04 Nov	British Airways
30 Oct - 10 Nov	KLM
29 Oct - 03 Nov	KLM
30 Oct - 03 Nov	KLM
29 Oct - 02 Nov	KLM
31 Oct - 03 Nov	KLM
24 Oct - 02 Nov	KLM
31 Oct - 02 Nov	KLM
31 Oct - 05 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 250€

Return flights