Cheapest return flights from London to Keflavik in December from $146

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 - 06 Dec British Airways direct
16 Dec - 14 Jan British Airways direct
09 Dec - 17 Dec British Airways direct
10 Dec - 17 Dec British Airways direct
01 Dec - 03 Dec British Airways direct
17 Dec - 21 Dec British Airways direct
03 Dec - 09 Dec British Airways direct
04 Dec - 07 Dec Icelandair direct
06 Dec - 09 Dec Icelandair direct
12 Dec - 14 Dec Icelandair direct
29 Dec - 14 Jan Icelandair direct
26 Dec - 11 Jan Icelandair direct
27 Dec - 09 Jan Icelandair direct
24 Dec - 01 Jan Icelandair direct
31 Dec - 04 Jan Icelandair direct
24 Dec - 02 Jan Icelandair direct
31 Dec - 03 Jan Icelandair direct
25 Dec - 11 Jan Icelandair direct
26 Dec - 04 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.

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