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

Return flights

31 Aug - 07 Sep	easyJet	direct
31 Aug - 03 Sep	easyJet	direct
31 Aug - 09 Sep	easyJet
31 Aug - 05 Sep	easyJet
31 Aug - 04 Sep	easyJet
29 Aug - 03 Sep	Jet2
30 Aug - 03 Sep	Ryanair
30 Aug - 07 Sep	Ryanair
29 Aug - 04 Sep	Wizz Air
30 Aug - 04 Sep	Ryanair
29 Aug - 31 Aug	Jet2
30 Aug - 31 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 193€

Return flights