AirHint found the following cheapest return flights from London (STN) to Keflavik (KEF) in August 2026 (see full year).

Return flights

25 Aug - 06 Sep	Ryanair
25 Aug - 29 Aug	Ryanair
18 Aug - 25 Aug	Ryanair
25 Aug - 05 Sep	Ryanair
28 Aug - 06 Sep	Ryanair
24 Aug - 06 Sep	Ryanair
19 Aug - 26 Aug	Ryanair
11 Aug - 18 Aug	Ryanair
10 Aug - 20 Aug	Ryanair
17 Aug - 24 Aug	Ryanair
25 Aug - 04 Sep	Ryanair
14 Aug - 22 Aug	Ryanair
08 Aug - 20 Aug	Ryanair
24 Aug - 04 Sep	Ryanair
29 Aug - 05 Sep	Ryanair
10 Aug - 22 Aug	Ryanair
21 Aug - 24 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 199€

Return flights