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

Return flights

22 Apr - 07 May	SWISS
01 Apr - 16 Apr	Lufthansa
20 Apr - 23 Apr	Lufthansa
19 Apr - 23 Apr	Lufthansa
24 Apr - 29 Apr	British Airways
06 Apr - 13 Apr	Lufthansa
15 Apr - 22 Apr	KLM
12 Apr - 15 Apr	KLM
09 Apr - 16 Apr	KLM
28 Apr - 06 May	KLM
02 Apr - 06 Apr	KLM
02 Apr - 05 Apr	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 $345

Return flights