Cheapest return flights from London to Keflavik in September from $577

AirHint found the following cheapest return flights from London (LCY) to Keflavik (KEF) in September 2026 (see full year).

Return flights

14 Sep - 24 Sep SWISS
06 Sep - 15 Sep Lufthansa
02 Sep - 09 Sep Aer Lingus
23 Sep - 30 Sep KLM
15 Sep - 23 Sep KLM
11 Sep - 22 Sep SWISS
05 Sep - 13 Sep KLM
19 Sep - 27 Sep KLM
23 Sep - 28 Sep Lufthansa
25 Sep - 28 Sep Lufthansa
24 Sep - 01 Oct KLM
19 Sep - 02 Oct KLM
30 Sep - 09 Oct KLM
26 Sep - 06 Oct KLM
29 Sep - 02 Oct KLM

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

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