Air Miles Calculator

Distance between Rock Springs, WY (RKS) and Decatur, IL (DEC)

Flight distance from Rock Springs to Decatur (Southwest Wyoming Regional Airport – Decatur Airport) is 1065 miles / 1714 kilometers / 925 nautical miles. Estimated flight time is 2 hours 30 minutes.

Driving distance from Rock Springs (RKS) to Decatur (DEC) is 1169 miles / 1882 kilometers and travel time by car is about 19 hours 26 minutes.

Map of flight path and driving directions from Rock Springs to Decatur.

Shortest flight path between Southwest Wyoming Regional Airport (RKS) and Decatur Airport (DEC).

How far is Decatur from Rock Springs?

There are several ways to calculate distances between Rock Springs and Decatur. Here are two common methods:

Vincenty's formula (applied above)
  • 1065.005 miles
  • 1713.959 kilometers
  • 925.464 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
  • 1062.352 miles
  • 1709.690 kilometers
  • 923.159 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 Southwest Wyoming Regional Airport
City: Rock Springs, WY
Country: United States Flag of United States
IATA Code: RKS
ICAO Code: KRKS
Coordinates: 41°35′39″N, 109°3′54″W

B Decatur Airport
City: Decatur, IL
Country: United States Flag of United States
IATA Code: DEC
ICAO Code: KDEC
Coordinates: 39°50′4″N, 88°51′56″W

Time difference and current local times

The time difference between Rock Springs and Decatur is 1 hour. Decatur is 1 hour ahead of Rock Springs.

Time Difference

Rock Springs, WY

 MDT

Decatur, IL

 CDT

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 155 kg (341 pounds).

Frequent Flyer Miles Calculator

Rock Springs (RKS) → Decatur (DEC).

Distance:
1065
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1065

Round trip?