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

Return flights

25 Mar - 30 Mar	Ryanair
17 Mar - 19 Mar	easyJet
10 Mar - 17 Mar	easyJet
02 Mar - 07 Mar	Ryanair
24 Mar - 26 Mar	easyJet
16 Mar - 21 Mar	Ryanair
10 Mar - 19 Mar	easyJet
03 Mar - 12 Mar	easyJet
23 Mar - 30 Mar	Ryanair
17 Mar - 24 Mar	easyJet
24 Mar - 02 Apr	Ryanair
25 Mar - 01 Apr	Ryanair
25 Mar - 13 Apr	easyJet
17 Mar - 13 Apr	easyJet
23 Mar - 05 Apr	Ryanair
25 Mar - 02 Apr	easyJet
21 Mar - 04 Apr	Ryanair
26 Mar - 23 Apr	Ryanair
26 Mar - 13 Apr	Ryanair
19 Mar - 05 Apr	Ryanair

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 $137

Return flights