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

Distance from Dewey, SD to Allen, SD

Distance

144 mi

Time

3 hours 43 mins

Gas Cost

$13 - $25

There are 107.66 miles from Dewey to Allen in east direction and 144 miles (231.75 kilometers) by car, following the US-18 route.

Dewey and Allen are 3 hours 43 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Allen, SD. The halfway point is Oglala, SD.

Dewey, SD and Allen, SD are in the same time zone (MDT). Current time in both locations is 12:17 am.

Any questions or tips to share?

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

Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Allen, 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 5.79 gallons of gas to cover the route between Dewey, SD and Allen, SD.

The estimated cost of gas to go from Dewey to Allen is $17.94.

During the route, an average car will release 113.52 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 $3.10 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Dewey, SD and Allen, SD

If you want to meet halfway between Dewey, SD and Allen, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.188301 and -102.966881, or 43º 11' 17.8836" N, 102º 58' 0.7716" W. This location is 72.14 miles away from Dewey, SD and Allen, SD and it would take approximately 1 hour 51 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Oglala, SD, situated 85 miles from Dewey, SD and 59 miles from Allen, SD. It would take 2 hours 12 mins to go from Dewey to Oglala and 1 hour 36 mins to go from Allen to Oglala.