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

Return flights

21 Aug - 24 Aug	Air India
22 Aug - 25 Aug	Air India
04 Aug - 20 Aug	Air India
27 Aug - 30 Aug	Air India
28 Aug - 31 Aug	Air India
27 Aug - 10 Sep	Air India
12 Aug - 10 Sep	Air India
03 Aug - 31 Aug	Air India
02 Aug - 18 Aug	Air India
23 Aug - 01 Sep	Air India
02 Aug - 30 Aug	Air India
13 Aug - 11 Sep	Air India
13 Aug - 14 Aug	Air India
21 Aug - 24 Aug	SriLankan Airlines	direct
27 Aug - 10 Sep	SriLankan Airlines	direct
13 Aug - 11 Sep	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 345€

Return flights