Cheapest return flights from London to Keflavik in September from $205

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

Return flights

29 Sep - 09 Oct Icelandair direct
04 Sep - 10 Sep Scandinavian Airlines
25 Sep - 04 Oct Scandinavian Airlines
19 Sep - 04 Oct Scandinavian Airlines
28 Sep - 03 Oct Icelandair direct
23 Sep - 03 Oct Icelandair direct
30 Sep - 03 Oct Icelandair direct
29 Sep - 08 Oct Scandinavian Airlines
18 Sep - 23 Sep Lufthansa
16 Sep - 23 Sep Lufthansa
11 Sep - 17 Sep Icelandair direct
19 Sep - 03 Oct Icelandair direct
30 Sep - 09 Oct Icelandair direct
03 Sep - 10 Sep Icelandair direct
04 Sep - 17 Sep Icelandair direct
04 Sep - 10 Sep Icelandair direct
22 Sep - 25 Sep Icelandair direct
08 Sep - 18 Sep SWISS
06 Sep - 10 Sep Icelandair direct
25 Sep - 02 Oct Scandinavian Airlines

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

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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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