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

Return flights

09 Jul - 17 Jul	SWISS
09 Jul - 22 Jul	SWISS
09 Jul - 14 Jul	SWISS
23 Jul - 28 Jul	KLM
23 Jul - 27 Jul	KLM
23 Jul - 01 Aug	KLM
16 Jul - 28 Jul	SWISS
27 Jul - 06 Aug	KLM
27 Jul - 03 Aug	KLM
27 Jul - 01 Aug	KLM
10 Jul - 17 Jul	SWISS
17 Jul - 24 Jul	SWISS
15 Jul - 22 Jul	Lufthansa
23 Jul - 26 Jul	KLM
31 Jul - 05 Aug	KLM
30 Jul - 05 Aug	SWISS
31 Jul - 04 Aug	KLM
31 Jul - 06 Aug	KLM
30 Jul - 13 Aug	KLM
30 Jul - 04 Aug	KLM

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 315€

Return flights