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

Return flights

20 Apr - 27 Apr	Lufthansa
13 Apr - 20 Apr	Lufthansa
01 Apr - 09 Apr	SWISS
10 Apr - 14 Apr	Lufthansa
17 Apr - 20 Apr	Lufthansa
24 Apr - 27 Apr	Lufthansa
01 Apr - 07 Apr	SWISS
12 Apr - 16 Apr	Lufthansa
01 Apr - 02 Apr	Lufthansa
20 Apr - 29 Apr	KLM
29 Apr - 03 May	KLM
27 Apr - 03 May	KLM
22 Apr - 01 May	KLM
11 Apr - 25 May	KLM
26 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 $468

Return flights