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

Return flights

18 Sep - 28 Sep	Air Arabia
17 Sep - 27 Sep	Air Arabia
20 Sep - 27 Sep	Air Arabia
15 Sep - 22 Sep	Flynas
22 Sep - 27 Sep	Air Arabia
22 Sep - 28 Sep	Air Arabia
18 Sep - 10 Oct	Air Arabia
15 Sep - 20 Sep	Flynas
29 Sep - 06 Oct	Flynas
30 Sep - 07 Oct	Pegasus Airlines
25 Sep - 29 Sep	Pegasus Airlines
26 Sep - 30 Sep	Pegasus Airlines
26 Sep - 12 Oct	Pegasus Airlines
28 Sep - 05 Oct	Air Arabia
23 Sep - 28 Oct	Air Arabia Abu Dhabi
24 Sep - 29 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 432€

Return flights