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

Distance from Dewey, SD to Spencer, SD

Distance

390 mi

Time

7 hours 6 mins

Gas Cost

$35 - $68

There are 322.67 miles from Dewey to Spencer in east direction and 390 miles (627.64 kilometers) by car, following the I-90 and US-14 route.

Dewey and Spencer are 7 hours 6 mins far apart, if you drive non-stop .

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

Please note the time difference between Dewey, SD and Spencer, SD is 1 hour. The current time in Dewey is 9:02 am and the current time in Spencer is 10:02 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Spencer, 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 15.67 gallons of gas to cover the route between Dewey, SD and Spencer, SD.

The estimated cost of gas to go from Dewey to Spencer is $49.13.

During the route, an average car will release 307.04 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 Spencer, SD

If you want to meet halfway between Dewey, SD and Spencer, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.899181 and -101.086998, or 43º 53' 57.0516" N, 101º 5' 13.1928" W. This location is 195.11 miles away from Dewey, SD and Spencer, SD and it would take approximately 3 hours 33 mins 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 175 miles from Spencer, SD. It would take 3 hours 44 mins to go from Dewey to Okaton and 2 hours 22 mins to go from Spencer to Okaton.