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

Return flights

16 Jul - 22 Jul	SWISS
10 Jul - 17 Jul	SWISS
10 Jul - 22 Jul	SWISS
02 Jul - 08 Jul	SWISS
16 Jul - 21 Jul	SWISS
09 Jul - 18 Jul	SWISS
09 Jul - 23 Jul	KLM
09 Jul - 14 Jul	SWISS
13 Jul - 23 Jul	KLM
14 Jul - 18 Jul	Air Dolomiti
27 Jul - 03 Aug	KLM
27 Jul - 01 Aug	KLM
27 Jul - 10 Aug	KLM
30 Jul - 06 Aug	KLM
30 Jul - 08 Aug	KLM
23 Jul - 06 Aug	KLM
30 Jul - 05 Aug	SWISS
30 Jul - 03 Aug	KLM
30 Jul - 07 Aug	SWISS
24 Jul - 07 Aug	SWISS

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

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 July from $378

Return flights