Distance between cities › USA › Illinois › Mason, IL › Distance from Mason to Okaton Book Hotels

Distance from Mason, IL to Okaton, SD

Distance

940 mi

Time

16 hours 24 mins

Gas Cost

$88 - $172

There are 720.21 miles from Mason to Okaton in northwest direction and 940 miles (1,512.78 kilometers) by car, following the I-90 route.

Mason and Okaton are 16 hours 24 mins far apart, if you drive non-stop .

This is the fastest route from Mason, IL to Okaton, SD.

Mason, IL and Okaton, SD are in the same time zone (CDT). Current time in both locations is 1:24 am.

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Lowest Price Rental Cars in Mason, IL

Planning on renting a car to go from Mason, IL to Okaton, SD? Here there are some offers to rent a car in Mason, IL

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Mason »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 37.77 gallons of gas to cover the route between Mason, IL and Okaton, SD.

The estimated cost of gas to go from Mason to Okaton is $124.28.

During the route, an average car will release 739.89 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.29 per gallon of regular gas. Price last updated on March 13, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Mason, IL and Okaton, SD

If you want to meet halfway between Mason, IL and Okaton, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 41.493301 and -94.249191, or 41º 29' 35.8836" N, 94º 14' 57.0876" W. This location is 470.18 miles away from Mason, IL and Okaton, SD and it would take approximately 8 hours 12 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Dexter, IA, situated 476 miles from Mason, IL and 466 miles from Okaton, SD. It would take 8 hours 41 mins to go from Mason to Dexter and 7 hours 47 mins to go from Okaton to Dexter.