How far is Decatur, IL, from Rapid City, SD?
The distance between Rapid City (Rapid City Regional Airport) and Decatur (Decatur Airport) is 786 miles / 1264 kilometers / 683 nautical miles.
The driving distance from Rapid City (RAP) to Decatur (DEC) is 957 miles / 1540 kilometers, and travel time by car is about 17 hours 8 minutes.
Rapid City Regional Airport – Decatur Airport
Search flights
Distance from Rapid City to Decatur
There are several ways to calculate the distance from Rapid City to Decatur. Here are two standard methods:
Vincenty's formula (applied above)- 785.596 miles
- 1264.294 kilometers
- 682.664 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- 783.945 miles
- 1261.637 kilometers
- 681.229 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 Rapid City to Decatur?
The estimated flight time from Rapid City Regional Airport to Decatur Airport is 1 hour and 59 minutes.
What is the time difference between Rapid City and Decatur?
The time difference between Rapid City and Decatur is 1 hour. Decatur is 1 hour ahead of Rapid City.
Flight carbon footprint between Rapid City Regional Airport (RAP) and Decatur Airport (DEC)
On average, flying from Rapid City to Decatur generates about 133 kg of CO2 per passenger, and 133 kilograms equals 294 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Rapid City to Decatur
See the map of the shortest flight path between Rapid City Regional Airport (RAP) and Decatur Airport (DEC).
Airport information
| Origin | Rapid City Regional Airport |
|---|---|
| City: | Rapid City, SD |
| Country: | United States  |
| IATA Code: | RAP |
| ICAO Code: | KRAP |
| Coordinates: | 44°2′43″N, 103°3′25″W |
| Destination | Decatur Airport |
|---|---|
| City: | Decatur, IL |
| Country: | United States |
| IATA Code: | DEC |
| ICAO Code: | KDEC |
| Coordinates: | 39°50′4″N, 88°51′56″W |