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

Return flights

19 Jan - 25 Jan	KLM
08 Jan - 15 Jan	KLM
19 Jan - 22 Jan	KLM
05 Jan - 12 Jan	KLM
05 Jan - 08 Jan	KLM
12 Jan - 16 Jan	KLM
12 Jan - 15 Jan	KLM
14 Jan - 17 Jan	KLM
08 Jan - 14 Jan	KLM
08 Jan - 12 Jan	KLM
29 Jan - 01 Feb	KLM
29 Jan - 02 Feb	KLM
29 Jan - 04 Feb	KLM
27 Jan - 03 Feb	Aer Lingus
30 Jan - 01 Feb	Aer Lingus
27 Jan - 01 Feb	Aer Lingus
30 Jan - 02 Feb	Aer Lingus

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

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 January from $273

Return flights