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

Return flights

27 Aug - 14 Sep	Ryanair
23 Aug - 29 Aug	Ryanair
13 Aug - 27 Aug	Ryanair
29 Aug - 01 Sep	Ryanair
13 Aug - 20 Aug	Ryanair
12 Aug - 17 Aug	Ryanair
22 Aug - 27 Aug	Ryanair
25 Aug - 27 Aug	Ryanair
21 Aug - 31 Aug	Ryanair
22 Aug - 31 Aug	Ryanair
21 Aug - 24 Aug	Ryanair
07 Aug - 08 Aug	Ryanair
25 Aug - 10 Sep	Ryanair
18 Aug - 01 Sep	Ryanair
15 Aug - 17 Sep	Ryanair
28 Aug - 06 Sep	Ryanair
01 Aug - 28 Sep	Ryanair

Also check the deals for one-way flights from Warsaw 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 Warsaw to Keflavik in August from 407€

Return flights