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

Distance from Dewey, SD to Harper, OR

Distance

975 mi

Time

17 hours 16 mins

Gas Cost

$91 - $177

There are 677.51 miles from Dewey to Harper in west direction and 975 miles (1,569.11 kilometers) by car, following the I-80 and US-30 and WY 789 route.

Dewey and Harper are 17 hours 16 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Harper, OR.

Dewey, SD and Harper, OR are in the same time zone (MDT). Current time in both locations is 9:09 am.

Any questions or tips to share?

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

Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Harper, OR? 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 39.15 gallons of gas to cover the route between Dewey, SD and Harper, OR.

The estimated cost of gas to go from Dewey to Harper is $127.70.

During the route, an average car will release 766.97 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 Harper, OR

If you want to meet halfway between Dewey, SD and Harper, OR or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 41.298363 and -110.614729, or 41º 17' 54.1068" N, 110º 36' 53.0244" W. This location is 487.38 miles away from Dewey, SD and Harper, OR and it would take approximately 8 hours 38 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Piedmont, WY, situated 492 miles from Dewey, SD and 498 miles from Harper, OR. It would take 9 hours 12 mins to go from Dewey to Piedmont and 8 hours 41 mins to go from Harper to Piedmont.