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

Distance from Dewey, SD to Ashton, SD

Distance

415 mi

Time

8 hours 1 min

Gas Cost

$37 - $72

There are 292.26 miles from Dewey to Ashton in northeast direction and 415 miles (667.88 kilometers) by car, following the I-90 and US-14 route.

Dewey and Ashton are 8 hours 1 min far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Ashton, SD. The halfway point is Okaton, SD.

Please note the time difference between Dewey, SD and Ashton, SD is 1 hour. The current time in Dewey is 12:24 am and the current time in Ashton is 1:24 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Ashton, 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 16.67 gallons of gas to cover the route between Dewey, SD and Ashton, SD.

The estimated cost of gas to go from Dewey to Ashton is $52.27.

During the route, an average car will release 326.67 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 Ashton, SD

If you want to meet halfway between Dewey, SD and Ashton, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.892204 and -100.895874, or 43º 53' 31.9344" N, 100º 53' 45.1464" W. This location is 207.59 miles away from Dewey, SD and Ashton, SD and it would take approximately 4 hours to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Okaton, SD, situated 217 miles from Dewey, SD and 219 miles from Ashton, SD. It would take 3 hours 44 mins to go from Dewey to Okaton and 3 hours 47 mins to go from Ashton to Okaton.