Air Miles Calculator

Distance between San Diego, CA (SAN) and Decatur, IL (DEC)

Flight distance from San Diego to Decatur (San Diego International Airport – Decatur Airport) is 1647 miles / 2651 kilometers / 1431 nautical miles. Estimated flight time is 3 hours 37 minutes.

Driving distance from San Diego (SAN) to Decatur (DEC) is 1985 miles / 3195 kilometers and travel time by car is about 33 hours 15 minutes.

Map of flight path and driving directions from San Diego to Decatur.

Shortest flight path between San Diego International Airport (SAN) and Decatur Airport (DEC).

How far is Decatur from San Diego?

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

Vincenty's formula (applied above)
  • 1647.216 miles
  • 2650.937 kilometers
  • 1431.392 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
  • 1644.085 miles
  • 2645.898 kilometers
  • 1428.671 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 San Diego International Airport
City: San Diego, CA
Country: United States Flag of United States
IATA Code: SAN
ICAO Code: KSAN
Coordinates: 32°44′0″N, 117°11′24″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 San Diego and Decatur is 2 hours. Decatur is 2 hours ahead of San Diego.

Time Difference

San Diego, CA

 PST

Decatur, IL

 CST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 189 kg (417 pounds).

Frequent Flyer Miles Calculator

San Diego (SAN) → Decatur (DEC).

Distance:
1647
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1647

Round trip?