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

Return flights

14 Oct - 16 Oct	Fly Play	direct
12 Oct - 16 Oct	Fly Play	direct
12 Oct - 19 Oct	Fly Play	direct
12 Oct - 18 Oct	Fly Play	direct
14 Oct - 18 Oct	Fly Play	direct
03 Oct - 07 Oct	Fly Play	direct
03 Oct - 08 Oct	Fly Play	direct
03 Oct - 06 Oct	Fly Play	direct
03 Oct - 14 Oct	Fly Play	direct
13 Oct - 16 Oct	Fly Play	direct
31 Oct - 06 Nov	Fly Play
31 Oct - 07 Nov	Fly Play
27 Oct - 06 Nov	Ryanair
31 Oct - 01 Nov	Fly Play
28 Oct - 06 Nov	Fly Play
30 Oct - 06 Nov	Ryanair
27 Oct - 02 Nov	Ryanair
18 Oct - 01 Nov	Ryanair
29 Oct - 01 Nov	Ryanair
29 Oct - 02 Nov	Ryanair

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 109€

Return flights