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