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

Return flights

01 Sep - 08 Sep	IndiGo
03 Sep - 24 Sep	Air Arabia
02 Sep - 24 Sep	Air Arabia
05 Sep - 12 Sep	IndiGo
04 Sep - 18 Sep	Air Arabia
07 Sep - 23 Sep	IndiGo
05 Sep - 19 Sep	IndiGo
04 Sep - 11 Sep	IndiGo
08 Sep - 13 Sep	Pegasus Airlines
11 Sep - 18 Sep	Flynas
03 Sep - 14 Oct	Flynas
22 Sep - 06 Oct	Pegasus Airlines
23 Sep - 07 Oct	AJet
24 Sep - 07 Oct	Pegasus Airlines
24 Sep - 20 Oct	Pegasus Airlines
08 Sep - 29 Oct	IndiGo
20 Sep - 17 Oct	Pegasus Airlines
24 Sep - 17 Oct	Pegasus Airlines
22 Sep - 16 Oct	Pegasus Airlines
25 Sep - 16 Oct	Pegasus Airlines

Also check the deals for one-way flights from Istanbul 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 Istanbul to Kathmandu in September from 429€

Return flights