Distance From Tribhuvan International Airport to Ontario International Airport, KTM - ONT Distance

The distance from Tribhuvan International Airport (KTM) to Ontario International Airport (ONT) is 7913 miles or 12735 kilometers or 6872 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Kathmandu ( Nepal ) to Ontario ( United States )?

A one-way nonstop (direct) flight between Kathmandu and Ontario takes around 18 hours 11 minutes.

Estimated flight time from Tribhuvan International Airport, Kathmandu, Nepal to Ontario International Airport, Ontario, United States is 18 hours 11 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • KTM - ONT

Kilometers		12735 km
Statute Miles		7913 miles
Nautical Miles		6872 nm
Avg. Time of Flight		18 hours 11 minutes

Tribhuvan International Airport to Ontario International Airport Flight Route Map - KTM to ONT Flight Path

Location of Tribhuvan International Airport & Ontario International Airport is given below.
Click the map to view Kathmandu to Ontario nonstop flight path and travel direction.

Click to see flight route on Google Map between Kathmandu, Nepal and Ontario, United States. .

Nonstop flight route between Kathmandu, Nepal and Ontario, United States.

Time Difference Between the Airports • KTM - ONT

Time difference between Kathmandu (Nepal) and Ontario (United States) is 12 Hours 45 Minutes.
Ontario time is 12 Hours 45 Minutes behind Kathmandu.

Location	Local Time
Kathmandu (Nepal)	2026-03-21, 06:30:33 +0545
Ontario (United States)	2026-03-20, 17:45:33 PDT

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Tribhuvan International Airport (KTM / VNKT) Kathmandu, Nepal

Destination

Ontario International Airport (ONT / KONT) Ontario, United States