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

Return flights

04 Dec - 09 Dec	easyJet	direct
02 Dec - 09 Dec	easyJet	direct
05 Dec - 08 Dec	easyJet	direct
04 Dec - 08 Dec	easyJet	direct
27 Dec - 03 Jan	easyJet	direct
27 Dec - 09 Jan	easyJet	direct
08 Dec - 12 Dec	easyJet	direct
24 Dec - 31 Dec	easyJet	direct
26 Dec - 31 Dec	easyJet	direct
23 Dec - 30 Dec	easyJet	direct
24 Dec - 29 Dec	easyJet	direct
22 Dec - 29 Dec	easyJet	direct

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

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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Cheapest return flights from Keflavik to London in December from $99

Return flights