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

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

The driving distance from Rockford (RFD) to Ontario (ONT) is 1923 miles / 3094 kilometers, and travel time by car is about 33 hours 36 minutes.

Distance from Rockford to Ontario

There are several ways to calculate the distance from Rockford to Ontario. 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 Rockford to Ontario?

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

What is the time difference between Rockford and Ontario?

The time difference between Rockford and Ontario is 2 hours. Ontario is 2 hours behind Rockford.

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

On average, flying from Rockford to Ontario 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 Rockford to Ontario

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

Airport information

Origin	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

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