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

Return flights

27 Aug - 31 Aug	easyJet
13 Aug - 31 Aug	easyJet	direct
20 Aug - 31 Aug	easyJet	direct
10 Aug - 31 Aug	easyJet	direct
17 Aug - 31 Aug	easyJet	direct
03 Aug - 31 Aug	easyJet	direct
02 Aug - 31 Aug	Wizz Air
06 Aug - 31 Aug	easyJet
07 Aug - 31 Aug	Wizz Air
23 Aug - 31 Aug	easyJet
24 Aug - 08 Sep	easyJet
29 Aug - 01 Sep	transavia
30 Aug - 01 Sep	Fly Play
15 Aug - 01 Sep	Icelandair

Also check the deals for one-way flights from Keflavik to London 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 Keflavik to London in August from $162

Return flights