Cheapest return flights from London to Keflavik in December from $425

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

05 Dec - 09 Dec British Airways
02 Dec - 07 Dec British Airways
05 Dec - 08 Dec British Airways
04 Dec - 07 Dec British Airways
30 Dec - 08 Jan British Airways
30 Dec - 06 Jan British Airways
16 Dec - 22 Dec British Airways
05 Dec - 07 Dec Aer Lingus
23 Dec - 26 Dec British Airways
22 Dec - 26 Dec British Airways
18 Dec - 22 Dec British Airways
24 Dec - 30 Dec British Airways
30 Dec - 02 Jan British Airways
30 Dec - 04 Jan British Airways
27 Dec - 01 Jan British Airways
28 Dec - 04 Jan KLM
27 Dec - 02 Jan British Airways

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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik