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

Return flights

14 Dec - 24 Dec	KLM
09 Dec - 16 Dec	KLM
15 Dec - 24 Dec	ITA Airways
21 Dec - 24 Dec	KLM
15 Dec - 21 Dec	ITA Airways
26 Dec - 02 Jan	ITA Airways
21 Dec - 04 Jan	KLM
26 Dec - 30 Dec	ITA Airways
26 Dec - 28 Dec	ITA Airways
03 Dec - 06 Dec	Lufthansa
10 Dec - 14 Dec	Aer Lingus
03 Dec - 07 Dec	Aer Lingus
17 Dec - 06 Jan	KLM
31 Dec - 05 Jan	KLM
31 Dec - 03 Jan	KLM

Also check the deals for one-way flights from London to Keflavik 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 London to Keflavik in December from 360€

Return flights