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

Return flights

31 Aug - 17 Sep	easyJet	direct
31 Aug - 07 Sep	easyJet	direct
27 Aug - 07 Sep	easyJet	direct
27 Aug - 03 Sep	easyJet	direct
31 Aug - 03 Sep	easyJet	direct
31 Aug - 04 Sep	easyJet
31 Aug - 08 Sep	easyJet
27 Aug - 14 Sep	easyJet
31 Aug - 05 Sep	easyJet
31 Aug - 01 Sep	easyJet
20 Aug - 27 Aug	Wizz Air UK
26 Aug - 31 Aug	Ryanair
20 Aug - 26 Aug	Wizz Air UK
29 Aug - 31 Aug	Wizz Air
27 Aug - 31 Aug	easyJet	direct
28 Aug - 31 Aug	Ryanair
20 Aug - 27 Aug	easyJet	direct
24 Aug - 27 Aug	easyJet
21 Aug - 26 Aug	Wizz Air UK
26 Aug - 29 Aug	Wizz Air

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 155€

Return flights