Cheapest return flights from London to Keflavik in September from $313

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

Return flights

13 Sep - 23 Sep KLM
27 Sep - 01 Oct KLM
13 Sep - 16 Sep KLM
23 Sep - 01 Oct KLM
06 Sep - 13 Sep KLM
16 Sep - 23 Sep KLM
27 Sep - 05 Oct KLM
30 Sep - 07 Oct KLM
20 Sep - 27 Sep KLM
06 Sep - 14 Sep KLM
13 Sep - 18 Sep KLM
06 Sep - 09 Sep KLM
17 Sep - 27 Sep KLM
09 Sep - 13 Sep KLM
30 Sep - 11 Oct KLM
23 Sep - 14 Oct KLM
29 Sep - 06 Oct SWISS
27 Sep - 08 Oct KLM
26 Sep - 05 Oct KLM
28 Sep - 05 Oct Lufthansa

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

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