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

Return flights

20 Aug - 27 Aug	Air India
24 Aug - 01 Sep	Air India
21 Aug - 27 Aug	Air India
19 Aug - 26 Aug	IndiGo
26 Aug - 30 Aug	Air India
27 Aug - 30 Aug	Air India
22 Aug - 28 Aug	Air India
22 Aug - 25 Aug	IndiGo
21 Aug - 24 Aug	SriLankan Airlines	direct
21 Aug - 27 Aug	SriLankan Airlines	direct
24 Aug - 01 Sep	SriLankan Airlines	direct
20 Aug - 27 Aug	SriLankan Airlines	direct

Also check the deals for one-way flights from Kathmandu to Colombo 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.

Book a cheap hotel in Colombo

Cheap car rent in Colombo

Cheapest return flights from Kathmandu to Colombo in August from 320€

Return flights