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

Return flights

23 Aug - 20 Sep	Air India
09 Aug - 21 Aug	Air India
21 Aug - 24 Aug	Air India
06 Aug - 18 Aug	Air India
06 Aug - 21 Aug	Air India
06 Aug - 20 Aug	Air India
06 Aug - 19 Aug	Air India
24 Aug - 21 Sep	Air India
22 Aug - 25 Aug	Air India
14 Aug - 21 Aug	Air India
05 Aug - 21 Aug	Air India
07 Aug - 10 Aug	Air India
28 Aug - 04 Sep	Air India
24 Aug - 21 Sep	SriLankan Airlines	direct
28 Aug - 04 Sep	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 305€

Return flights