AirHint found the following cheapest return flights from London (LHR) to Keflavik (KEF)
in September 2025 (see full year ).
Return flights
27 Sep
- 02 Oct
Icelandair
$ 171
direct
24 Sep
- 05 Oct
Icelandair
$ 176
direct
23 Sep
- 05 Oct
Icelandair
$ 176
direct
23 Sep
- 04 Oct
Icelandair
$ 176
direct
25 Sep
- 05 Oct
Icelandair
$ 177
direct
02 Sep
- 09 Sep
Icelandair
$ 181
direct
13 Sep
- 23 Sep
Icelandair
$ 181
direct
18 Sep
- 30 Sep
Icelandair
$ 181
direct
18 Sep
- 21 Sep
Icelandair
$ 181
direct
06 Sep
- 09 Sep
Icelandair
$ 182
direct
18 Sep
- 24 Sep
Icelandair
$ 182
direct
04 Sep
- 16 Sep
Icelandair
$ 182
direct
23 Sep
- 30 Sep
Icelandair
$ 183
direct
09 Sep
- 13 Sep
Icelandair
$ 183
direct
13 Sep
- 16 Sep
Icelandair
$ 183
direct
27 Sep
- 07 Oct
Icelandair
$ 183
direct
27 Sep
- 08 Oct
Icelandair
$ 183
direct
22 Sep
- 05 Oct
Icelandair
$ 183
direct
23 Sep
- 03 Oct
Icelandair
$ 189
direct
24 Sep
- 03 Oct
Icelandair
$ 190
direct
Also check the deals for one-way flights from London to Keflavik in September .
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.