Distance between cities › USA › South Dakota › Dewey, SD › Distance from Dewey to Union Book Hotels

Distance from Dewey, SD to Union, SC

Distance

1,669 mi

Time

1 day 7 hours

Gas Cost

$156 - $302

There are 1,341.25 miles from Dewey to Union in southeast direction and 1,669 miles (2,686.00 kilometers) by car, following the I-80 route.

Dewey and Union are 1 day 7 hours far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Union, SC.

Please note the time difference between Dewey, SD and Union, SC is 2 hours. The current time in Dewey is 10:17 am and the current time in Union is 12:17 pm.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Union, SC? Here there are some offers to rent a car in Dewey, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Dewey »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 67.04 gallons of gas to cover the route between Dewey, SD and Union, SC.

The estimated cost of gas to go from Dewey to Union is $218.67.

During the route, an average car will release 1,313.37 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 $3.26 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Dewey, SD and Union, SC

If you want to meet halfway between Dewey, SD and Union, SC or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 38.954181 and -93.106091, or 38º 57' 15.0516" N, 93º 6' 21.9276" W. This location is 834.60 miles away from Dewey, SD and Union, SC and it would take approximately 15 hours 48 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Nelson, MO, situated 826 miles from Dewey, SD and 848 miles from Union, SC. It would take 15 hours 45 mins to go from Dewey to Nelson and 16 hours 21 mins to go from Union to Nelson.