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

Return flights

13 Dec - 20 Dec	Pegasus Airlines
12 Dec - 21 Dec	Flynas
12 Dec - 19 Dec	Flynas
14 Dec - 20 Dec	Jazeera Airways
10 Dec - 17 Dec	Air Arabia
13 Dec - 22 Dec	Air Arabia
13 Dec - 19 Dec	Air Arabia
20 Dec - 24 Dec	AJet
06 Dec - 18 Dec	AJet
07 Dec - 13 Dec	Air Arabia
07 Dec - 07 Jan	Air Arabia
27 Dec - 07 Jan	Pegasus Airlines
06 Dec - 05 Jan	Air Arabia
06 Dec - 06 Jan	Air Arabia
13 Dec - 01 Jan	Turkish Airlines
06 Dec - 06 Jan	Turkish Airlines	direct
07 Dec - 07 Jan	Turkish Airlines	direct
06 Dec - 05 Jan	Turkish Airlines	direct
27 Dec - 07 Jan	Turkish Airlines	direct

Also check the deals for one-way flights from Istanbul to Kathmandu 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 Istanbul to Kathmandu in December from $473

Return flights