Cheapest return flights from Keflavik to London in September from $136

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

Return flights

10 Sep - 14 Sep easyJet direct
17 Sep - 24 Sep easyJet
24 Sep - 03 Oct easyJet
14 Sep - 17 Sep easyJet direct
03 Sep - 10 Sep easyJet
17 Sep - 24 Sep easyJet direct
07 Sep - 10 Sep easyJet direct
20 Sep - 24 Sep Wizz Air
03 Sep - 10 Sep easyJet direct
09 Sep - 15 Sep Wizz Air
25 Sep - 28 Sep Wizz Air
30 Sep - 09 Oct Wizz Air
26 Sep - 03 Oct Fly Play
27 Sep - 06 Oct easyJet
26 Sep - 10 Oct Fly Play
27 Sep - 02 Oct Icelandair

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