Cheapest return flights from London to Keflavik in September from $195

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

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

Return flights

29 Sep - 04 Oct Icelandair direct
20 Sep - 04 Oct Icelandair direct
24 Sep - 03 Oct Icelandair direct
21 Sep - 02 Oct Icelandair direct
24 Sep - 08 Oct Icelandair direct
01 Sep - 09 Sep Icelandair direct
02 Sep - 09 Sep Icelandair direct
30 Sep - 04 Oct Icelandair direct
29 Sep - 03 Oct Icelandair direct
23 Sep - 30 Sep Icelandair direct
22 Sep - 30 Sep Icelandair direct
06 Sep - 10 Sep Icelandair direct
03 Sep - 09 Sep Icelandair direct
20 Sep - 24 Sep Icelandair direct
28 Sep - 01 Oct Icelandair direct
28 Sep - 02 Oct Icelandair direct
26 Sep - 03 Oct Icelandair direct
11 Sep - 16 Sep Icelandair direct
08 Sep - 19 Sep Icelandair direct
04 Sep - 09 Sep Icelandair direct

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

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.

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