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

Return flights

24 Sep - 28 Sep	easyJet	direct
23 Sep - 30 Sep	Wizz Air
22 Sep - 28 Sep	easyJet
17 Sep - 24 Sep	easyJet	direct
30 Sep - 02 Oct	Wizz Air
24 Sep - 01 Oct	Wizz Air
21 Sep - 28 Sep	easyJet	direct
30 Sep - 01 Oct	Wizz Air
10 Sep - 17 Sep	easyJet	direct
22 Sep - 29 Sep	easyJet
28 Sep - 05 Oct	Wizz Air
18 Sep - 21 Sep	Wizz Air
25 Sep - 28 Sep	Wizz Air
22 Sep - 24 Sep	easyJet
24 Sep - 01 Oct	easyJet	direct
28 Sep - 05 Oct	easyJet	direct
26 Sep - 10 Oct	easyJet
29 Sep - 06 Oct	Fly Play

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

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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Cheapest return flights from Keflavik to London in September from 130€

Return flights