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

Return flights

22 Sep - 30 Sep	Turkish Airlines
26 Sep - 22 Oct	Pegasus Airlines
22 Sep - 25 Sep	Turkish Airlines
25 Sep - 25 Oct	TAROM
26 Sep - 14 Oct	Pegasus Airlines
22 Sep - 27 Sep	Pegasus Airlines
23 Sep - 25 Sep	Wizz Air Malta
20 Sep - 06 Oct	Pegasus Airlines
25 Sep - 02 Oct	Ryanair
22 Sep - 27 Oct	Pegasus Airlines
23 Sep - 30 Sep	Turkish Airlines
21 Sep - 28 Oct	Pegasus Airlines
26 Sep - 04 Oct	Ryanair
23 Sep - 29 Oct	Turkish Airlines
23 Sep - 28 Oct	Turkish Airlines
20 Sep - 20 Sep	flydubai

Also check the deals for one-way flights from Bucharest to Kathmandu 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 Kathmandu in September from 536€

Return flights