Cheapest return flights from Kathmandu to Colombo in September from $424

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

Return flights

17 Sep - 22 Sep Air India
14 Sep - 22 Sep Air India
13 Sep - 21 Sep Air India
29 Sep - 08 Oct Air India
17 Sep - 28 Sep Air India
17 Sep - 22 Sep SriLankan Airlines direct
29 Sep - 08 Oct SriLankan Airlines direct
14 Sep - 22 Sep SriLankan Airlines direct

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

Skyscanner

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

Feel free to contact us with any feedback or request another flight research.