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

Return flights

07 Dec - 14 Dec	Pegasus Airlines
12 Dec - 20 Dec	Pegasus Airlines
16 Dec - 20 Dec	Pegasus Airlines
08 Dec - 15 Dec	Pegasus Airlines
15 Dec - 19 Dec	Pegasus Airlines
13 Dec - 01 Jan	Kuwait Airways
26 Dec - 27 Dec	Air Arabia
27 Dec - 28 Dec	Air Arabia
12 Dec - 01 Jan	Kuwait Airways
01 Dec - 03 Dec	Air Arabia
21 Dec - 04 Jan	Pegasus Airlines
20 Dec - 28 Dec	Pegasus Airlines
08 Dec - 15 Dec	Turkish Airlines	direct
21 Dec - 04 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.

Book a cheap hotel in Kathmandu

Cheap car rent in Kathmandu

Cheapest return flights from Istanbul to Kathmandu in December from 385€

Return flights