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

Return flights

31 Aug - 08 Sep	easyJet
19 Aug - 23 Aug	easyJet
22 Aug - 01 Sep	easyJet
15 Aug - 23 Aug	easyJet
31 Aug - 07 Sep	easyJet
22 Aug - 27 Aug	easyJet
31 Aug - 04 Sep	easyJet
28 Aug - 31 Aug	Wizz Air Malta
31 Aug - 04 Sep	Icelandair	direct
30 Aug - 06 Sep	Icelandair	direct
31 Aug - 07 Sep	Icelandair	direct
30 Aug - 03 Sep	Icelandair	direct
27 Aug - 01 Sep	Icelandair
24 Aug - 01 Sep	easyJet
19 Aug - 22 Aug	easyJet
27 Aug - 31 Aug	Icelandair
25 Aug - 27 Aug	easyJet
19 Aug - 26 Aug	easyJet
20 Aug - 26 Aug	Icelandair	direct
24 Aug - 27 Aug	easyJet

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 $191

Return flights