Cheapest return flights from Colombo to Kathmandu in September from $372

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

Return flights

03 Sep - 11 Sep Air India
11 Sep - 14 Sep Air India
10 Sep - 13 Sep Air India
03 Sep - 11 Sep SriLankan Airlines direct
11 Sep - 14 Sep SriLankan Airlines direct
01 Sep - 30 Oct Air India
28 Sep - 04 Oct Air India
29 Sep - 05 Oct Air India
29 Sep - 05 Oct SriLankan Airlines direct

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

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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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