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

Return flights

10 Mar - 13 Mar	KLM
30 Mar - 07 Apr	Lufthansa
11 Mar - 25 Mar	KLM
05 Mar - 11 Mar	British Airways
23 Mar - 30 Mar	Lufthansa
30 Mar - 02 Apr	Lufthansa
13 Mar - 17 Mar	SWISS
20 Mar - 22 Mar	British Airways
06 Mar - 10 Mar	British Airways
19 Mar - 24 Mar	British Airways
20 Mar - 23 Mar	British Airways
13 Mar - 15 Mar	SWISS
31 Mar - 07 Apr	British Airways
25 Mar - 10 Apr	KLM
31 Mar - 08 Apr	KLM

Also check the deals for one-way 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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest return flights from London to Keflavik in March from 312€

Return flights