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

Distance from Dewey, SD to Saint Onge, SD

Distance

96 mi

Time

2 hours 25 mins

Gas Cost

$9 - $17

There are 71.96 miles from Dewey to Saint Onge in northeast direction and 96 miles (154.50 kilometers) by car, following the US-85 route.

Dewey and Saint Onge are 2 hours 25 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Saint Onge, SD. The halfway point is Sundance, WY.

Dewey, SD and Saint Onge, SD are in the same time zone (MDT). Current time in both locations is 8:40 am.

Any questions or tips to share?

Share with fellow travellers any question or tips about the route from Dewey, SD to Saint Onge, SD:

Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Saint Onge, 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 3.87 gallons of gas to cover the route between Dewey, SD and Saint Onge, SD.

The estimated cost of gas to go from Dewey to Saint Onge is $12.13.

During the route, an average car will release 75.82 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 Saint Onge, SD

If you want to meet halfway between Dewey, SD and Saint Onge, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.264111 and -104.303078, or 44º 15' 50.7996" N, 104º 18' 11.0808" W. This location is 48.18 miles away from Dewey, SD and Saint Onge, SD and it would take approximately 1 hour 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 Sundance, WY, situated 73 miles from Dewey, SD and 44 miles from Saint Onge, SD. It would take 1 hour 34 mins to go from Dewey to Sundance and 48 minutes to go from Saint Onge to Sundance.