Cheapest return flights from London to Keflavik in December from $138

Best time to book flights for London (LHR) to Keflavik (KEF) flights at AirHint

AirHint found the following cheapest return flights from London (LHR) to Keflavik (KEF) in December 2025 (see full year).

Return flights

03 Dec - 06 Dec British Airways direct
01 Dec - 04 Dec British Airways direct
01 Dec - 05 Dec British Airways direct
05 Dec - 07 Dec British Airways direct
01 Dec - 10 Dec British Airways direct
01 Dec - 03 Dec British Airways direct
04 Dec - 07 Dec British Airways direct
05 Dec - 08 Dec British Airways
04 Dec - 08 Dec British Airways direct
08 Dec - 12 Dec British Airways direct
24 Dec - 04 Jan Icelandair direct
22 Dec - 04 Jan Icelandair direct
26 Dec - 02 Jan Icelandair direct
28 Dec - 01 Jan Icelandair direct
20 Dec - 03 Jan Icelandair direct
27 Dec - 03 Jan Icelandair direct
17 Dec - 06 Jan Lufthansa
17 Dec - 02 Jan Lufthansa
17 Dec - 02 Jan Icelandair direct
17 Dec - 06 Jan Icelandair direct

Also check the deals for one-way flights from London to Keflavik in December.

Skyscanner

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