# Distance between San Francisco, CA (SFO) and Decatur, IL (DEC)

Flight distance from San Francisco to Decatur (San Francisco International Airport – Decatur Airport) is 1806 miles / 2907 kilometers / 1570 nautical miles. Estimated flight time is 3 hours 55 minutes.

Driving distance from San Francisco (SFO) to Decatur (DEC) is 2098 miles / 3377 kilometers and travel time by car is about 34 hours 27 minutes.

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

Shortest flight path between San Francisco International Airport (SFO) and Decatur Airport (DEC).

## How far is Decatur from San Francisco?

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

Vincenty's formula (applied above)
• 1806.473 miles
• 2907.236 kilometers
• 1569.782 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
• 1802.142 miles
• 2900.267 kilometers
• 1566.019 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 Francisco International Airport
City: San Francisco, CA
Country: United States
IATA Code: SFO
ICAO Code: KSFO
Coordinates: 37°37′8″N, 122°22′30″W

B Decatur Airport
City: Decatur, IL
Country: 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 Francisco and Decatur is 2 hours. Decatur is 2 hours ahead of San Francisco.

PDT

CDT

## Carbon dioxide emissions

Estimated CO2 emissions per passenger is 201 kg (442 pounds).

## Frequent Flyer Miles Calculator

San Francisco (SFO) → Decatur (DEC).

Distance:
1806
Elite level bonus:
0
Booking class bonus:
0

### In total

Total frequent flyer miles:
1806

Round trip?