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

Return flights

16 Sep - 13 Oct	easyJet
22 Sep - 13 Oct	Ryanair
15 Sep - 13 Oct	Ryanair
22 Sep - 20 Oct	Ryanair
22 Sep - 18 Oct	Ryanair
08 Sep - 30 Sep	Wizz Air
22 Sep - 28 Sep	Ryanair
27 Sep - 18 Oct	Wizz Air Malta
22 Sep - 30 Sep	Ryanair
22 Sep - 05 Oct	Ryanair
08 Sep - 22 Sep	Wizz Air
22 Sep - 29 Sep	Ryanair
22 Sep - 14 Oct	Ryanair
27 Sep - 04 Oct	Wizz Air Malta
10 Sep - 10 Oct	Pegasus Airlines
09 Sep - 30 Sep	Pegasus Airlines
08 Sep - 23 Sep	Wizz Air
22 Sep - 24 Sep	Ryanair
10 Sep - 30 Sep	Pegasus Airlines
16 Sep - 23 Sep	easyJet

Also check the deals for one-way flights from Lisbon 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 Lisbon to Kathmandu in September from $768

Return flights