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

Return flights

04 Dec - 07 Dec	Air India
02 Dec - 12 Dec	Air India
21 Dec - 30 Dec	Air India
21 Dec - 24 Dec	Air India
06 Dec - 18 Dec	Air India
08 Dec - 19 Dec	Air India
10 Dec - 17 Dec	Air India
10 Dec - 18 Dec	Air India
12 Dec - 18 Dec	Air India
02 Dec - 07 Dec	Air India
29 Dec - 03 Jan	Air India

Also check the deals for one-way flights from Kolkata 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 Kolkata to Kathmandu in December from $248

Return flights