Cheapest return flights from London to Keflavik in December from $453

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

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

Return flights

04 Dec - 10 Dec British Airways
02 Dec - 08 Dec British Airways
05 Dec - 08 Dec British Airways
18 Dec - 22 Dec British Airways
15 Dec - 18 Dec British Airways
19 Dec - 21 Dec British Airways
19 Dec - 23 Dec British Airways
22 Dec - 26 Dec British Airways
22 Dec - 28 Dec British Airways
27 Dec - 01 Jan British Airways
09 Dec - 16 Dec KLM
30 Dec - 02 Jan Aer Lingus
21 Dec - 04 Jan KLM
27 Dec - 05 Jan KLM
21 Dec - 02 Jan KLM
29 Dec - 04 Jan British Airways
27 Dec - 02 Jan KLM
26 Dec - 02 Jan KLM
31 Dec - 02 Jan KLM
29 Dec - 02 Jan KLM

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

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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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