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How far is Seattle, WA, from Decatur, IL?

The distance between Decatur (Decatur Airport) and Seattle (Seattle–Tacoma International Airport) is 1742 miles / 2803 kilometers / 1514 nautical miles.

The driving distance from Decatur (DEC) to Seattle (SEA) is 2116 miles / 3405 kilometers, and travel time by car is about 37 hours 32 minutes.

Decatur Airport – Seattle–Tacoma International Airport

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1742
Miles
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2803
Kilometers
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1514
Nautical miles

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Distance from Decatur to Seattle

There are several ways to calculate the distance from Decatur to Seattle. Here are two standard methods:

Vincenty's formula (applied above)
  • 1741.795 miles
  • 2803.148 kilometers
  • 1513.579 nautical miles

Vincenty's formula calculates the distance between latitude/longitude points on the earth's surface using an ellipsoidal model of the planet.

Haversine formula
  • 1737.640 miles
  • 2796.460 kilometers
  • 1509.967 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).

How long does it take to fly from Decatur to Seattle?

The estimated flight time from Decatur Airport to Seattle–Tacoma International Airport is 3 hours and 47 minutes.

Flight carbon footprint between Decatur Airport (DEC) and Seattle–Tacoma International Airport (SEA)

On average, flying from Decatur to Seattle generates about 196 kg of CO2 per passenger, and 196 kilograms equals 431 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.

Map of flight path and driving directions from Decatur to Seattle

See the map of the shortest flight path between Decatur Airport (DEC) and Seattle–Tacoma International Airport (SEA).

Airport information

Origin 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
Destination Seattle–Tacoma International Airport
City: Seattle, WA
Country: United States Flag of United States
IATA Code: SEA
ICAO Code: KSEA
Coordinates: 47°26′56″N, 122°18′32″W