# Distance between Seattle, WA (BFI) and Decatur, IL (DEC)

Flight distance from Seattle to Decatur (Seattle Boeing Field – Decatur Airport) is 1742 miles / 2803 kilometers / 1514 nautical miles. Estimated flight time is 3 hours 47 minutes.

Driving distance from Seattle (BFI) to Decatur (DEC) is 2148 miles / 3457 kilometers and travel time by car is about 35 hours 19 minutes.

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

Shortest flight path between Seattle Boeing Field (BFI) and Decatur Airport (DEC).

## How far is Decatur from Seattle?

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

Vincenty's formula (applied above)
• 1741.983 miles
• 2803.451 kilometers
• 1513.742 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
• 1737.835 miles
• 2796.774 kilometers
• 1510.137 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 Seattle Boeing Field
City: Seattle, WA
Country: United States
IATA Code: BFI
ICAO Code: KBFI
Coordinates: 47°31′47″N, 122°18′7″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 Seattle and Decatur is 2 hours. Decatur is 2 hours ahead of Seattle.

PST

CST

## Carbon dioxide emissions

Estimated CO2 emissions per passenger is 196 kg (431 pounds).

## Frequent Flyer Miles Calculator

Seattle (BFI) → Decatur (DEC).

Distance:
1742
Elite level bonus:
0
Booking class bonus:
0

### In total

Total frequent flyer miles:
1742

Round trip?