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

Return flights

15 Jul - 24 Jul	KLM
10 Jul - 17 Jul	KLM
22 Jul - 24 Jul	KLM
22 Jul - 26 Jul	KLM
22 Jul - 29 Jul	KLM
24 Jul - 30 Jul	KLM
17 Jul - 26 Jul	KLM
17 Jul - 02 Aug	KLM
31 Jul - 09 Aug	KLM
24 Jul - 02 Aug	KLM
01 Jul - 03 Jul	KLM
17 Jul - 23 Jul	KLM
08 Jul - 12 Jul	KLM
29 Jul - 04 Aug	SWISS
29 Jul - 11 Aug	SWISS
16 Jul - 04 Aug	KLM
30 Jul - 14 Aug	KLM
25 Jul - 06 Aug	KLM
30 Jul - 06 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 $575

Return flights