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

Distance from Dewey, SD to Lamar, MS

Distance

1,238 mi

Time

1 day

Gas Cost

$115 - $224

There are 985.06 miles from Dewey to Lamar in southeast direction and 1,238 miles (1,992.37 kilometers) by car, following the I-80 route.

Dewey and Lamar are 1 day far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Lamar, MS.

Please note the time difference between Dewey, SD and Lamar, MS is 1 hour. The current time in Dewey is 4:31 am and the current time in Lamar is 5:31 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Lamar, MS? 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 49.71 gallons of gas to cover the route between Dewey, SD and Lamar, MS.

The estimated cost of gas to go from Dewey to Lamar is $162.16.

During the route, an average car will release 973.96 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 Lamar, MS

If you want to meet halfway between Dewey, SD and Lamar, MS or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 40.659419 and -95.888581, or 40º 39' 33.9084" N, 95º 53' 18.8916" W. This location is 618.92 miles away from Dewey, SD and Lamar, MS and it would take approximately 12 hours 2 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Nebraska City, NE, situated 591 miles from Dewey, SD and 647 miles from Lamar, MS. It would take 11 hours 18 mins to go from Dewey to Nebraska City and 12 hours 49 mins to go from Lamar to Nebraska City.