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

Return flights

09 Mar - 13 Mar	KLM
04 Mar - 09 Mar	KLM
16 Mar - 27 Mar	KLM
17 Mar - 23 Mar	KLM
23 Mar - 29 Mar	KLM
03 Mar - 12 Mar	KLM
07 Mar - 15 Mar	KLM
14 Mar - 22 Mar	KLM
02 Mar - 05 Mar	British Airways
02 Mar - 06 Mar	British Airways
26 Mar - 14 Apr	KLM
26 Mar - 05 Apr	KLM
28 Mar - 12 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 $425

Return flights