AirHint found the following cheapest return flights from London (LHR) to Keflavik (KEF)
in December 2025 (see full year ).
Return flights
03 Dec
- 06 Dec
British Airways
$ 146
direct
01 Dec
- 06 Dec
British Airways
$ 149
direct
16 Dec
- 14 Jan
British Airways
$ 170
direct
09 Dec
- 17 Dec
British Airways
$ 173
direct
10 Dec
- 17 Dec
British Airways
$ 173
direct
01 Dec
- 03 Dec
British Airways
$ 173
direct
17 Dec
- 21 Dec
British Airways
$ 174
direct
03 Dec
- 09 Dec
British Airways
$ 177
direct
04 Dec
- 07 Dec
Icelandair
$ 177
direct
06 Dec
- 09 Dec
Icelandair
$ 177
direct
12 Dec
- 14 Dec
Icelandair
$ 178
direct
29 Dec
- 14 Jan
Icelandair
$ 219
direct
26 Dec
- 11 Jan
Icelandair
$ 224
direct
27 Dec
- 09 Jan
Icelandair
$ 241
direct
24 Dec
- 01 Jan
Icelandair
$ 242
direct
31 Dec
- 04 Jan
Icelandair
$ 242
direct
24 Dec
- 02 Jan
Icelandair
$ 255
direct
31 Dec
- 03 Jan
Icelandair
$ 267
direct
25 Dec
- 11 Jan
Icelandair
$ 273
direct
26 Dec
- 04 Jan
Icelandair
$ 282
direct
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.