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

Return flights

13 Apr - 20 Apr	Lufthansa
15 Apr - 23 Apr	SWISS
08 Apr - 14 Apr	SWISS
15 Apr - 20 Apr	SWISS
22 Apr - 30 Apr	SWISS
24 Apr - 27 Apr	Lufthansa
01 Apr - 16 Apr	SWISS
20 Apr - 28 Apr	Lufthansa
20 Apr - 27 Apr	Lufthansa
13 Apr - 16 Apr	Lufthansa
30 Apr - 04 May	KLM
25 Apr - 03 May	KLM
29 Apr - 13 May	KLM
24 Apr - 01 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 295€

Return flights