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

Return flights

21 Aug - 08 Sep	SWISS
26 Aug - 30 Aug	KLM
19 Aug - 26 Aug	KLM
12 Aug - 19 Aug	KLM
02 Aug - 09 Aug	KLM
27 Aug - 31 Aug	KLM
28 Aug - 01 Sep	SWISS
05 Aug - 12 Aug	KLM
19 Aug - 30 Aug	KLM
23 Aug - 08 Sep	SWISS
24 Aug - 08 Sep	SWISS
05 Aug - 18 Aug	SWISS
22 Aug - 08 Sep	SWISS
06 Aug - 11 Aug	SWISS
14 Aug - 31 Aug	KLM
21 Aug - 02 Sep	KLM
24 Aug - 02 Sep	KLM
25 Aug - 04 Sep	KLM
29 Aug - 05 Sep	SWISS

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 $340

Return flights