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

Return flights

01 Dec - 08 Jan	Air Arabia
18 Dec - 04 Jan	Air Arabia
07 Dec - 14 Jan	Air Arabia
13 Dec - 27 Dec	Air Arabia
18 Dec - 31 Dec	Air Arabia
04 Dec - 12 Dec	Kuwait Airways
13 Dec - 28 Dec	Air Arabia
11 Dec - 18 Dec	Air Arabia
25 Dec - 28 Dec	Air Arabia
19 Dec - 04 Jan	Air Arabia
21 Dec - 08 Jan	Air Arabia
21 Dec - 09 Jan	Air Arabia
20 Dec - 05 Jan	Air Arabia
20 Dec - 10 Jan	Air Arabia
03 Dec - 11 Dec	Air Arabia
01 Dec - 08 Jan	Turkish Airlines	direct
11 Dec - 18 Dec	Turkish Airlines	direct
25 Dec - 28 Dec	Turkish Airlines	direct
07 Dec - 14 Jan	Turkish Airlines	direct
13 Dec - 28 Dec	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 $508

Return flights