AirHint found the following cheapest return flights from Bucharest (OTP) to Warsaw (WAW) in September 2025 (see full year).

Return flights

04 Sep - 07 Sep	Wizz Air Malta
03 Sep - 08 Sep	Wizz Air Malta
10 Sep - 16 Sep	Austrian Airlines
18 Sep - 22 Sep	Austrian Airlines
06 Sep - 08 Sep	Austrian Airlines
06 Sep - 09 Sep	Austrian Airlines
16 Sep - 17 Sep	Wizz Air Malta
29 Sep - 03 Oct	Austrian Airlines
19 Sep - 20 Sep	Austrian Airlines
26 Sep - 27 Sep	Austrian Airlines
06 Sep - 07 Sep	Wizz Air Malta
29 Sep - 03 Oct	LOT	direct

Also check the deals for one-way flights from Bucharest to Warsaw 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 Bucharest to Warsaw in September from $143

Return flights