How far is Rockford, IL, from Ontario, CA?

The distance between Ontario (Ontario International Airport) and Rockford (Chicago Rockford International Airport) is 1642 miles / 2643 kilometers / 1427 nautical miles.

The driving distance from Ontario (ONT) to Rockford (RFD) is 1922 miles / 3093 kilometers, and travel time by car is about 33 hours 38 minutes.

Distance from Ontario to Rockford

There are several ways to calculate the distance from Ontario to Rockford. Here are two standard methods:

Vincenty's formula (applied above)

• 1641.986 miles
• 2642.521 kilometers
• 1426.847 nautical miles

Vincenty's formula calculates the distance between latitude/longitude points on the earth's surface using an ellipsoidal model of the planet.

Haversine formula

• 1638.861 miles
• 2637.492 kilometers
• 1424.132 nautical miles

The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance – the shortest distance between two points).

How long does it take to fly from Ontario to Rockford?

The estimated flight time from Ontario International Airport to Chicago Rockford International Airport is 3 hours and 36 minutes.

What is the time difference between Ontario and Rockford?

The time difference between Ontario and Rockford is 2 hours. Rockford is 2 hours ahead of Ontario.

Flight carbon footprint between Ontario International Airport (ONT) and Chicago Rockford International Airport (RFD)

On average, flying from Ontario to Rockford generates about 189 kg of CO2 per passenger, and 189 kilograms equals 416 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.

Map of flight path and driving directions from Ontario to Rockford

See the map of the shortest flight path between Ontario International Airport (ONT) and Chicago Rockford International Airport (RFD).

Airport information

Origin	Ontario International Airport
City:	Ontario, CA
Country:	United States
IATA Code:	ONT
ICAO Code:	KONT
Coordinates:	34°3′21″N, 117°36′3″W

Destination	Chicago Rockford International Airport
City:	Rockford, IL
Country:	United States
IATA Code:	RFD
ICAO Code:	KRFD
Coordinates:	42°11′43″N, 89°5′49″W