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Yes. SriLankan Airlines flies nonstop from Kathmandu (KTM) to Colombo (CMB). The flight takes about 3h 31m and covers 1,462 miles (2,353 km).
SriLankan Airlines operates nonstop flights from Kathmandu to Colombo.
The nonstop flight from Kathmandu to Colombo takes ~3h 31m (approximately 2353 km).