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

Return flights

17 Sep - 22 Sep	Ryanair
20 Sep - 24 Sep	Ryanair
17 Sep - 25 Sep	Ryanair
20 Sep - 22 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
19 Sep - 21 Sep	Ryanair
10 Sep - 17 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
22 Sep - 27 Sep	Ryanair
14 Sep - 17 Sep	Ryanair
19 Sep - 24 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
26 Sep - 03 Oct	Ryanair
27 Sep - 02 Oct	Ryanair
11 Sep - 10 Oct	Ryanair
30 Sep - 04 Oct	Ryanair
23 Sep - 07 Oct	Ryanair
11 Sep - 15 Oct	Ryanair
28 Sep - 05 Oct	Ryanair
11 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 $311

Return flights