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

Return flights

25 Sep - 29 Sep	Ryanair
25 Sep - 28 Sep	Ryanair
26 Sep - 03 Oct	Ryanair
25 Sep - 12 Oct	Ryanair
22 Sep - 29 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
22 Sep - 26 Sep	Ryanair
11 Sep - 18 Sep	Ryanair
12 Sep - 19 Sep	Ryanair
11 Sep - 19 Sep	Ryanair
19 Sep - 23 Sep	Ryanair
18 Sep - 28 Sep	Ryanair
25 Sep - 11 Oct	Ryanair

Also check the deals for one-way flights from Warsaw to Keflavik in September.

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 September from 250€

Return flights