AirHint found the following cheapest one-way flights from London (LHR) to Keflavik (KEF) in March 2026 (see full year).

One-Way flights

15 Mar	British Airways	direct
17 Mar	British Airways	direct
06 Mar	British Airways	direct
11 Mar	British Airways	direct
07 Mar	British Airways	direct
10 Mar	British Airways	direct
22 Mar	British Airways	direct
23 Mar	British Airways	direct
21 Mar	Scandinavian Airlines
25 Mar	Icelandair	direct

Also check the deals for return flights from London to Keflavik in March.

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 one-way flights from London to Keflavik in March from $108

One-Way flights