Distance From Alton Airport to Ontario International Airport

The distance from Alton Airport () to Ontario International Airport (ONT) is 1484 miles or 2388 kilometers or 1289 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 Alton ( United States ) to Ontario ( United States )?

A one-way nonstop (direct) flight between Alton and Ontario takes around 3 hours 24 minutes.

Estimated flight time from Alton Airport, Alton, United States to Ontario International Airport, Ontario, United States is 3 hours 24 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		2388 km
Statute Miles		1484 miles
Nautical Miles		1289 nm
Avg. Time of Flight		3 hours 24 minutes

Alton Airport to Ontario International Airport Flight Route Map - to ONT Flight Path

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

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

Nonstop flight route between Alton, United States and Ontario, United States.

Time Difference Between the Airports • - ONT

Time difference between Alton (United States) and Ontario (United States) is 3 Hours.
Ontario time is 3 Hours behind Alton.

Location	Local Time
Alton (United States)	2026-09-17, 11:11:22 EDT
Ontario (United States)	2026-09-17, 08:11:22 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

Alton Airport ( / ) Alton, United States

Destination

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