Distance between cities › USA › Montana › Roberts, MT › Distance from Roberts to Marion Book Hotels

Distance from Roberts, MT to Marion, SD

Distance

697 mi

Time

12 hours 10 mins

Gas Cost

$64 - $124

There are 602.32 miles from Roberts to Marion in southeast direction and 697 miles (1,121.71 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Roberts and Marion are 12 hours 10 mins far apart, if you drive non-stop .

This is the fastest route from Roberts, MT to Marion, SD.

Please note the time difference between Roberts, MT and Marion, SD is 1 hour. The current time in Roberts is 12:00 am and the current time in Marion is 1:00 am.

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Lowest Price Rental Cars in Roberts, MT

Planning on renting a car to go from Roberts, MT to Marion, SD? Here there are some offers to rent a car in Roberts, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Roberts »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 27.99 gallons of gas to cover the route between Roberts, MT and Marion, SD.

The estimated cost of gas to go from Roberts to Marion is $89.69.

During the route, an average car will release 548.42 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 $3.20 per gallon of regular gas. Price last updated on March 11, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Roberts, MT and Marion, SD

If you want to meet halfway between Roberts, MT and Marion, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.203146 and -103.353936, or 44º 12' 11.3256" N, 103º 21' 14.1696" W. This location is 348.50 miles away from Roberts, MT and Marion, SD and it would take approximately 6 hours 5 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Summerset, SD, situated 353 miles from Roberts, MT and 345 miles from Marion, SD. It would take 6 hours 37 mins to go from Roberts to Summerset and 5 hours 37 mins to go from Marion to Summerset.