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

Return flights

18 Dec - 09 Jan	IndiGo
16 Dec - 23 Dec	IndiGo
19 Dec - 27 Dec	IndiGo
20 Dec - 28 Dec	IndiGo
20 Dec - 24 Dec	Air Arabia
28 Dec - 02 Jan	Air Arabia
24 Dec - 01 Jan	Air Arabia
27 Dec - 01 Jan	Air Arabia
28 Dec - 01 Jan	Air Arabia
12 Dec - 13 Dec	IndiGo
29 Dec - 03 Jan	Air Arabia
27 Dec - 03 Jan	Air Arabia
28 Dec - 04 Jan	Air Arabia
27 Dec - 02 Jan	Air Arabia
26 Dec - 26 Dec	Air Arabia
27 Dec - 27 Dec	flydubai
28 Dec - 03 Jan	Air Arabia
20 Dec - 28 Dec	Turkish Airlines	direct
20 Dec - 24 Dec	Turkish Airlines	direct
28 Dec - 28 Dec	Emirates

Also check the deals for one-way flights from Kathmandu to Istanbul in December.

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 Kathmandu to Istanbul in December from $425

Return flights