Cheapest return flights from Colombo to Kathmandu in September from $368

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

Return flights

01 Sep - 17 Sep Air India
07 Sep - 17 Sep Air India
02 Sep - 03 Sep Air India
03 Sep - 04 Sep Air India
07 Sep - 14 Sep Air India
08 Sep - 18 Sep IndiGo
30 Sep - 07 Oct Air India
26 Sep - 11 Oct Air India
01 Sep - 17 Sep SriLankan Airlines direct
03 Sep - 04 Sep SriLankan Airlines direct
07 Sep - 17 Sep SriLankan Airlines direct
08 Sep - 18 Sep SriLankan Airlines direct
29 Sep - 09 Oct Air India
30 Sep - 10 Oct Air India
21 Sep - 01 Oct Air India
21 Sep - 01 Oct SriLankan Airlines direct
28 Sep - 13 Oct Air India
28 Sep - 13 Oct SriLankan Airlines direct
29 Sep - 09 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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