Air Miles Calculator

Distance between Spokane, WA (GEG) and Decatur, IL (DEC)

Flight distance from Spokane to Decatur (Spokane International Airport – Decatur Airport) is 1522 miles / 2449 kilometers / 1323 nautical miles. Estimated flight time is 3 hours 22 minutes.

Driving distance from Spokane (GEG) to Decatur (DEC) is 1873 miles / 3014 kilometers and travel time by car is about 30 hours 34 minutes.

Map of flight path and driving directions from Spokane to Decatur.

Shortest flight path between Spokane International Airport (GEG) and Decatur Airport (DEC).

How far is Decatur from Spokane?

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

Vincenty's formula (applied above)
  • 1521.958 miles
  • 2449.353 kilometers
  • 1322.545 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
  • 1518.497 miles
  • 2443.784 kilometers
  • 1319.538 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 Spokane International Airport
City: Spokane, WA
Country: United States Flag of United States
IATA Code: GEG
ICAO Code: KGEG
Coordinates: 47°37′11″N, 117°32′2″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 Spokane and Decatur is 2 hours. Decatur is 2 hours ahead of Spokane.

Time Difference

Spokane, WA

 PST

Decatur, IL

 CST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 181 kg (399 pounds).

Frequent Flyer Miles Calculator

Spokane (GEG) → Decatur (DEC).

Distance:
1522
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1522

Round trip?