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

Return flights

16 Aug - 23 Aug	Air India
26 Aug - 29 Aug	Air India
24 Aug - 27 Aug	Air India
23 Aug - 29 Aug	Air India
19 Aug - 23 Aug	Air India
02 Aug - 07 Aug	Air India
12 Aug - 20 Aug	Air India
19 Aug - 25 Aug	Air India
15 Aug - 19 Aug	Air India
21 Aug - 25 Aug	Air India
30 Aug - 04 Sep	Air India
26 Aug - 05 Sep	Air India
30 Aug - 17 Sep	Air India
29 Aug - 03 Sep	Air India

Also check the deals for one-way flights from Kolkata to Kathmandu in August.

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 August from $244

Return flights