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

Return flights

03 Aug - 08 Aug	Air India
01 Aug - 15 Aug	Air India
06 Aug - 11 Aug	Air India
09 Aug - 15 Aug	Air India
04 Aug - 10 Aug	Air India
03 Aug - 09 Aug	Air India
15 Aug - 22 Aug	Air India
11 Aug - 13 Aug	Air India
11 Aug - 13 Aug	SriLankan Airlines	direct
04 Aug - 10 Aug	SriLankan Airlines	direct

Also check the deals for one-way flights from Colombo 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 Colombo to Kathmandu in August from $372

Return flights