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

Return flights

25 Sep - 09 Oct	Icelandair	direct
16 Sep - 23 Sep	Wizz Air UK
17 Sep - 01 Oct	Wizz Air Malta
16 Sep - 01 Oct	Wizz Air Malta
02 Sep - 02 Oct	Wizz Air Malta
25 Sep - 01 Oct	Norwegian
30 Sep - 02 Oct	Wizz Air UK
24 Sep - 07 Oct	Wizz Air Malta
24 Sep - 02 Oct	Wizz Air UK
26 Sep - 10 Oct	easyJet
19 Sep - 25 Sep	Wizz Air UK
18 Sep - 25 Sep	Norwegian
20 Sep - 23 Sep	Norwegian
29 Sep - 02 Oct	Vueling Airlines
10 Sep - 17 Sep	Wizz Air Malta
01 Sep - 09 Sep	Wizz Air Malta
24 Sep - 25 Sep	Wizz Air Malta
15 Sep - 17 Sep	Vueling Airlines
04 Sep - 09 Sep	Norwegian
10 Sep - 25 Sep	Wizz Air Malta

Also check the deals for one-way flights from London to Keflavik 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 London to Keflavik in September from 153€

Return flights