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

Return flights

31 Aug - 03 Sep	easyJet
27 Aug - 01 Sep	easyJet
31 Aug - 10 Sep	easyJet	direct
31 Aug - 03 Sep	easyJet	direct
17 Aug - 20 Aug	easyJet	direct
24 Aug - 27 Aug	easyJet
20 Aug - 27 Aug	easyJet
10 Aug - 13 Aug	easyJet	direct
29 Aug - 03 Sep	easyJet
06 Aug - 13 Aug	easyJet	direct
03 Aug - 13 Aug	easyJet	direct
29 Aug - 01 Sep	easyJet
13 Aug - 20 Aug	easyJet	direct
24 Aug - 27 Aug	easyJet	direct
30 Aug - 03 Sep	easyJet
20 Aug - 27 Aug	easyJet	direct
30 Aug - 01 Sep	easyJet
20 Aug - 23 Aug	easyJet
29 Aug - 10 Sep	easyJet
28 Aug - 01 Sep	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 $129

Return flights