Distance From Sonohara Dam Heliport to Ontario International Airport

The distance from Sonohara Dam Heliport () to Ontario International Airport (ONT) is 5493 miles or 8840 kilometers or 4771 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 Numata ( Japan ) to Ontario ( United States )?

A one-way nonstop (direct) flight between Numata and Ontario takes around 12 hours 37 minutes.

Estimated flight time from Sonohara Dam Heliport, Numata, Japan to Ontario International Airport, Ontario, United States is 12 hours 37 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 • - ONT

Kilometers		8840 km
Statute Miles		5493 miles
Nautical Miles		4771 nm
Avg. Time of Flight		12 hours 37 minutes

Sonohara Dam Heliport to Ontario International Airport Flight Route Map - to ONT Flight Path

Location of Sonohara Dam Heliport & Ontario International Airport is given below.
Click the map to view Numata to Ontario nonstop flight path and travel direction.

Click to see flight route on Google Map between Numata, Japan and Ontario, United States. .

Nonstop flight route between Numata, Japan and Ontario, United States.

Time Difference Between the Airports • - ONT

Time difference between Numata (Japan) and Ontario (United States) is 16 Hours.
Ontario time is 16 Hours behind Numata.

Location	Local Time
Numata (Japan)	2026-03-20, 22:01:51 JST
Ontario (United States)	2026-03-20, 06:01:51 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

Sonohara Dam Heliport ( / ) Numata, Japan

Destination

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