Air Miles Calculator

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

Distance from Seattle to Decatur (Boeing Field – Decatur Airport) is 1742 miles / 2803 kilometers / 1514 nautical miles.

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).

Flight duration

Estimated flight time from Boeing Field (BFI) to Decatur Airport (DEC) is 3 hours 47 minutes.

Time difference and current local times

The time difference between Seattle and Decatur is 2 hours. Decatur is 2 hours ahead of Seattle.

Time Difference

Seattle
Decatur

Seattle, WA

 PDT

Decatur, IL

 CDT

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 191 kg (422 pounds).

Airport information


A Boeing Field
City: Seattle, WA
Country: United States Flag of 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 Flag of United States
IATA Code: DEC
ICAO Code: KDEC
Coordinates: 39°50′4″N, 88°51′56″W

Seattle to Decatur flight path

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

Frequent Flyer Miles Calculator

Seattle (BFI) → Decatur (DEC).

Elite level bonus (%):
Booking class bonus (%):
Air miles:
1742
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1742

Round trip?