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

Return flights

05 Sep - 16 Sep	Thai Airways
03 Sep - 16 Sep	Thai Airways
04 Sep - 16 Sep	Thai Airways
06 Sep - 16 Sep	Thai Airways
07 Sep - 16 Sep	Thai Airways
08 Sep - 16 Sep	Thai Airways
09 Sep - 16 Sep	Thai Airways
10 Sep - 16 Sep	Thai Airways
10 Sep - 17 Sep	Thai Airways
10 Sep - 22 Sep	Thai Airways
07 Sep - 09 Oct	Thai Airways
23 Sep - 31 Oct	Thai Airways

Also check the deals for one-way flights from Penang 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 Penang to Kathmandu in September from $507

Return flights