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

Distance from Mount Vernon, SD to Dewey, SD

Distance

353 mi

Time

6 hours 27 mins

Gas Cost

$32 - $62

There are 289.34 miles from Mount Vernon to Dewey in west direction and 353 miles (568.10 kilometers) by car, following the I-90 route.

Mount Vernon and Dewey are 6 hours 27 mins far apart, if you drive non-stop .

This is the fastest route from Mount Vernon, SD to Dewey, SD. The halfway point is Kadoka, SD.

Please note the time difference between Mount Vernon, SD and Dewey, SD is 1 hour. The current time in Mount Vernon is 6:40 am and the current time in Dewey is 5:40 am.

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Lowest Price Rental Cars in Mount Vernon, SD

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

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Mount Vernon »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 14.18 gallons of gas to cover the route between Mount Vernon, SD and Dewey, SD.

The estimated cost of gas to go from Mount Vernon to Dewey is $44.46.

During the route, an average car will release 277.84 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 Mount Vernon, SD and Dewey, SD

If you want to meet halfway between Mount Vernon, SD and Dewey, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.840633 and -101.442650, or 43º 50' 26.2788" N, 101º 26' 33.54" W. This location is 176.56 miles away from Mount Vernon, SD and Dewey, SD and it would take approximately 3 hours 13 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Kadoka, SD, situated 170 miles from Mount Vernon, SD and 184 miles from Dewey, SD. It would take 2 hours 14 mins to go from Mount Vernon to Kadoka and 3 hours 18 mins to go from Dewey to Kadoka.