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

Return flights

21 Sep - 29 Sep	Pegasus Airlines
29 Sep - 19 Oct	Ryanair
15 Sep - 05 Oct	Pegasus Airlines
20 Sep - 01 Oct	Iberia
15 Sep - 30 Sep	Pegasus Airlines
22 Sep - 06 Oct	Wizz Air
26 Sep - 12 Oct	Pegasus Airlines
19 Sep - 29 Sep	Wizz Air Malta
26 Sep - 11 Oct	Wizz Air
21 Sep - 24 Sep	Pegasus Airlines
16 Sep - 23 Sep	Etihad Airways
23 Sep - 01 Oct	Pegasus Airlines
17 Sep - 28 Sep	Pegasus Airlines
29 Sep - 14 Oct	Ryanair
24 Sep - 09 Oct	Pegasus Airlines
17 Sep - 24 Sep	Pegasus Airlines
27 Sep - 11 Oct	Wizz Air Malta
18 Sep - 21 Sep	ITA Airways
18 Sep - 25 Sep	Iberia
22 Sep - 28 Sep	Ryanair

Also check the deals for one-way flights from Madrid 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 Madrid to Kathmandu in September from 629€

Return flights