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

Return flights

15 Apr - 29 Apr	British Airways	direct
22 Apr - 25 Apr	British Airways	direct
22 Apr - 29 Apr	British Airways	direct
09 Apr - 14 Apr	Icelandair	direct
24 Apr - 26 Apr	Icelandair	direct
11 Apr - 14 Apr	Icelandair	direct
09 Apr - 13 Apr	Icelandair	direct
22 Apr - 27 Apr	Icelandair	direct
15 Apr - 20 Apr	Icelandair	direct
16 Apr - 21 Apr	Icelandair	direct
27 Apr - 17 May	Icelandair	direct
30 Apr - 04 May	Icelandair	direct

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 155€

Return flights