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

Return flights

10 Sep - 26 Oct	Ryanair
04 Sep - 10 Sep	Etihad Airways
03 Sep - 10 Sep	Etihad Airways
02 Sep - 09 Sep	Etihad Airways
24 Sep - 31 Oct	TAP
05 Sep - 20 Sep	KLM
04 Sep - 17 Sep	IndiGo
08 Sep - 28 Sep	IndiGo
01 Sep - 08 Sep	IndiGo
17 Sep - 18 Sep	IndiGo
16 Sep - 23 Sep	IndiGo
13 Sep - 16 Sep	IndiGo
11 Sep - 09 Oct	Emirates
13 Sep - 14 Oct	Turkish Airlines
26 Sep - 03 Oct	IndiGo
26 Sep - 18 Oct	IndiGo
28 Sep - 13 Oct	IndiGo
29 Sep - 05 Oct	IndiGo
26 Sep - 11 Oct	IndiGo
26 Sep - 10 Oct	IndiGo

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 753€

Return flights