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

Distance from Dewey, SD to Amherst, SD

Distance

486 mi

Time

9 hours 45 mins

Gas Cost

$44 - $85

There are 337.20 miles from Dewey to Amherst in northeast direction and 486 miles (782.14 kilometers) by car, following the I-90 and US-14 route.

Dewey and Amherst are 9 hours 45 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Amherst, SD. The halfway point is Vivian, SD.

Please note the time difference between Dewey, SD and Amherst, SD is 1 hour. The current time in Dewey is 1:47 am and the current time in Amherst is 2:47 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Amherst, SD? 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 19.53 gallons of gas to cover the route between Dewey, SD and Amherst, SD.

The estimated cost of gas to go from Dewey to Amherst is $61.24.

During the route, an average car will release 382.71 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 $3.14 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Dewey, SD and Amherst, SD

If you want to meet halfway between Dewey, SD and Amherst, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.911770 and -100.185318, or 43º 54' 42.372" N, 100º 11' 7.1448" W. This location is 243.20 miles away from Dewey, SD and Amherst, SD and it would take approximately 4 hours 52 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Vivian, SD, situated 248 miles from Dewey, SD and 277 miles from Amherst, SD. It would take 4 hours 11 mins to go from Dewey to Vivian and 5 hours 28 mins to go from Amherst to Vivian.