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

Return flights

26 Sep - 02 Oct	Ryanair
19 Sep - 22 Sep	Ryanair
01 Sep - 05 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
01 Sep - 03 Sep	Ryanair
10 Sep - 14 Sep	Ryanair
03 Sep - 07 Sep	Ryanair
29 Sep - 01 Oct	Ryanair
01 Sep - 11 Sep	Ryanair
16 Sep - 22 Sep	Ryanair
06 Sep - 08 Sep	Ryanair
03 Sep - 06 Sep	Ryanair

Also check the deals for one-way flights from Warsaw to Oslo 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 Oslo in September from 187€

Return flights