How far is Decatur, IL, from Watertown, SD?

The distance between Watertown (Watertown Regional Airport) and Decatur (Decatur Airport) is 550 miles / 885 kilometers / 478 nautical miles.

The driving distance from Watertown (ATY) to Decatur (DEC) is 718 miles / 1156 kilometers, and travel time by car is about 13 hours 18 minutes.

Distance from Watertown to Decatur

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

Vincenty's formula (applied above)

• 549.835 miles
• 884.874 kilometers
• 477.794 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

• 549.207 miles
• 883.863 kilometers
• 477.248 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 Watertown to Decatur?

The estimated flight time from Watertown Regional Airport to Decatur Airport is 1 hour and 32 minutes.

What is the time difference between Watertown and Decatur?

There is no time difference between Watertown and Decatur.

Flight carbon footprint between Watertown Regional Airport (ATY) and Decatur Airport (DEC)

On average, flying from Watertown to Decatur generates about 106 kg of CO2 per passenger, and 106 kilograms equals 234 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.

Map of flight path and driving directions from Watertown to Decatur

See the map of the shortest flight path between Watertown Regional Airport (ATY) and Decatur Airport (DEC).

Airport information

Origin	Watertown Regional Airport
City:	Watertown, SD
Country:	United States
IATA Code:	ATY
ICAO Code:	KATY
Coordinates:	44°54′50″N, 97°9′16″W

Destination	Decatur Airport
City:	Decatur, IL
Country:	United States
IATA Code:	DEC
ICAO Code:	KDEC
Coordinates:	39°50′4″N, 88°51′56″W