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

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

The driving distance from Decatur (DEC) to Watertown (ATY) is 739 miles / 1189 kilometers, and travel time by car is about 13 hours 17 minutes.

Distance from Decatur to Watertown

There are several ways to calculate the distance from Decatur to Watertown. 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 Decatur to Watertown?

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

What is the time difference between Decatur and Watertown?

There is no time difference between Decatur and Watertown.

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

On average, flying from Decatur to Watertown 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 Decatur to Watertown

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

Airport information

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

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