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

Return flights

29 Aug - 05 Sep	Norwegian
27 Aug - 10 Sep	easyJet
28 Aug - 02 Sep	Norwegian
29 Aug - 02 Sep	Norwegian
28 Aug - 03 Sep	Wizz Air Malta
28 Aug - 04 Sep	Wizz Air Malta
28 Aug - 07 Sep	Icelandair	direct
30 Aug - 03 Sep	Ryanair
27 Aug - 03 Sep	easyJet
29 Aug - 01 Sep	Ryanair
29 Aug - 31 Aug	Norwegian
25 Aug - 27 Aug	Wizz Air
28 Aug - 31 Aug	Wizz Air Malta
27 Aug - 31 Aug	easyJet
28 Aug - 29 Aug	Icelandair
26 Aug - 29 Aug	Norwegian
25 Aug - 28 Aug	Wizz Air
30 Aug - 31 Aug	Ryanair
27 Aug - 29 Aug	easyJet
23 Aug - 27 Aug	Wizz Air UK

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

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 August from 236€

Return flights