AirHint found the following cheapest one-way flights from Colombo (CMB) to Kathmandu (KTM) in September 2025 (see full year).
One-Way flights
| 17 Sep | Air India | ||
| 18 Sep | IndiGo | ||
| 16 Sep | Air India | ||
| 21 Sep | IndiGo | ||
| 19 Sep | IndiGo | ||
| 22 Sep | Air India | ||
| 25 Sep | SriLankan Airlines | ||
| 26 Sep | IndiGo | ||
| 29 Sep | SriLankan Airlines | ||
| 27 Sep | SriLankan Airlines |
Also check the deals for return flights from Colombo to Kathmandu in September.
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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