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

Return flights

15 Apr - 28 Apr	SWISS
08 Apr - 14 Apr	SWISS
13 Apr - 16 Apr	Lufthansa
10 Apr - 14 Apr	Lufthansa
03 Apr - 20 Apr	Lufthansa
06 Apr - 09 Apr	Lufthansa
03 Apr - 13 Apr	Lufthansa
23 Apr - 30 Apr	KLM
09 Apr - 14 Apr	KLM
22 Apr - 29 Apr	KLM
29 Apr - 03 May	KLM
25 Apr - 03 May	KLM

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

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 April from $357

Return flights