# Distance between Casper, WY (CPR) and Rockford, IL (RFD)

Flight distance from Casper to Rockford (Casper–Natrona County International Airport – Chicago Rockford International Airport) is 886 miles / 1426 kilometers / 770 nautical miles. Estimated flight time is 2 hours 10 minutes.

Driving distance from Casper (CPR) to Rockford (RFD) is 1092 miles / 1757 kilometers and travel time by car is about 18 hours 0 minutes.

## Map of flight path and driving directions from Casper to Rockford.

Shortest flight path between Casper–Natrona County International Airport (CPR) and Chicago Rockford International Airport (RFD).

## How far is Rockford from Casper?

There are several ways to calculate distances between Casper and Rockford. Here are two common methods:

Vincenty's formula (applied above)
• 886.085 miles
• 1426.015 kilometers
• 769.986 nautical miles

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

Haversine formula
• 883.748 miles
• 1422.255 kilometers
• 767.956 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).

## Airport information

A Casper–Natrona County International Airport
City: Casper, WY
Country: United States
IATA Code: CPR
ICAO Code: KCPR
Coordinates: 42°54′28″N, 106°27′50″W

B 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

## Time difference and current local times

The time difference between Casper and Rockford is 1 hour. Rockford is 1 hour ahead of Casper.

MST

CST

## Carbon dioxide emissions

Estimated CO2 emissions per passenger is 142 kg (314 pounds).

## Frequent Flyer Miles Calculator

Casper (CPR) → Rockford (RFD).

Distance:
886
Elite level bonus:
0
Booking class bonus:
0

### In total

Total frequent flyer miles:
886

Round trip?