Distance From Slovenj Gradec Airfield to Ontario International Airport

The distance from Slovenj Gradec Airfield () to Ontario International Airport (ONT) is 6144 miles or 9887 kilometers or 5335 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 Slovenc Gradec ( Slovenia ) to Ontario ( United States )?

A one-way nonstop (direct) flight between Slovenc Gradec and Ontario takes around 14 hours 7 minutes.

Estimated flight time from Slovenj Gradec Airfield, Slovenc Gradec, Slovenia to Ontario International Airport, Ontario, United States is 14 hours 7 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		9887 km
Statute Miles		6144 miles
Nautical Miles		5335 nm
Avg. Time of Flight		14 hours 7 minutes

Slovenj Gradec Airfield to Ontario International Airport Flight Route Map - to ONT Flight Path

Location of Slovenj Gradec Airfield & Ontario International Airport is given below.
Click the map to view Slovenc Gradec to Ontario nonstop flight path and travel direction.

Click to see flight route on Google Map between Slovenc Gradec, Slovenia and Ontario, United States. .

Nonstop flight route between Slovenc Gradec, Slovenia and Ontario, United States.

Time Difference Between the Airports • - ONT

Time difference between Slovenc Gradec (Slovenia) and Ontario (United States) is 9 Hours.
Ontario time is 9 Hours behind Slovenc Gradec.

Location	Local Time
Slovenc Gradec (Slovenia)	2026-05-02, 12:04:16 CEST
Ontario (United States)	2026-05-02, 03:04:16 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

Slovenj Gradec Airfield ( / LJSG) Slovenc Gradec, Slovenia

Destination

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