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

Return flights

28 Sep - 13 Oct	easyJet
18 Sep - 25 Sep	Wizz Air Malta
07 Sep - 18 Oct	Wizz Air
20 Sep - 21 Oct	TAP
04 Sep - 04 Oct	Etihad Airways
23 Sep - 14 Oct	easyJet
11 Sep - 10 Oct	Wizz Air
01 Sep - 01 Oct	Ryanair
01 Sep - 05 Sep	TAP
10 Sep - 11 Oct	Etihad Airways
02 Sep - 09 Oct	Etihad Airways
05 Sep - 10 Oct	easyJet
02 Sep - 09 Sep	KLM
08 Sep - 22 Sep	Turkish Airlines
04 Sep - 11 Sep	Etihad Airways
17 Sep - 24 Sep	Etihad Airways
02 Sep - 13 Sep	Etihad Airways
13 Sep - 28 Sep	Air France
15 Sep - 22 Sep	Qatar Airways
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 652€

Return flights