AirHint found the following cheapest return flights from London (LCY) to Keflavik (KEF) in August 2026 (see full year).

Return flights

26 Aug - 03 Sep	KLM
19 Aug - 26 Aug	KLM
12 Aug - 19 Aug	KLM
30 Aug - 06 Sep	KLM
09 Aug - 19 Aug	KLM
13 Aug - 27 Aug	KLM
18 Aug - 24 Aug	KLM
20 Aug - 25 Aug	SWISS
05 Aug - 14 Aug	KLM
02 Aug - 14 Aug	KLM
14 Aug - 20 Aug	SWISS
05 Aug - 11 Aug	SWISS
28 Aug - 02 Sep	KLM
24 Aug - 06 Sep	KLM
28 Aug - 04 Sep	KLM
28 Aug - 12 Sep	KLM

Also check the deals for one-way flights from London to Keflavik in August.

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 August from 308€

Return flights