Kathmandu (KTM) to Colombo (CMB): 1,462 miles (2,353 km) great-circle, about 3h 25m nonstop by our estimate. Cheapest fare observed: $513 round-trip on IndiGo, with 1 stop, departing April 29, 2026.
$513 round-trip, IndiGo 6E1162, departing 2026-04-29 at 20:50, returning 2026-05-09. The recorded itinerary left on a Wednesday, returning on a Saturday 10 nights later; the fare was observed 4 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $513, it ranked 11th of the 30 round-trip fares we recorded from KTM (median $659). That is 35.1 cents per great-circle mile (round-trip price over one-way distance), close to the KTM median of 37.6 cents across 28 round-trip routes.
Routes from KTM of similar length: Bangkok (1,385 mi) at $434 and Almaty (1,177 mi) at $686.
IndiGo had the cheapest fare on 6 of 30 KTM routes. It is the 17th longest of the 30 routes we track from KTM.
Of 15 departure airports with a fare to Colombo, Kathmandu (KTM) ranked 10th at $513. Lowest: $210 from Chennai (MAA); highest: $1494 from Edmonton (YEG); 5 nonstop. Cheapest-fare airlines (routes): IndiGo (3), SriLankan Airlines (2), Air Arabia Abu Dhabi (1), AirAsia (1), airline 01 (1) and Batik Air Malaysia (1), plus 6 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones Asia/Kathmandu, Asia/Colombo; flight time is our estimate.