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

Distance from Roberts, MT to Dennison, IL

Distance

1,421 mi

Time

1 day 1 hour

Gas Cost

$132 - $258

There are 1,169.04 miles from Roberts to Dennison in southeast direction and 1,421 miles (2,286.88 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Roberts and Dennison are 1 day 1 hour far apart, if you drive non-stop .

This is the fastest route from Roberts, MT to Dennison, IL.

Please note the time difference between Roberts, MT and Dennison, IL is 1 hour. The current time in Roberts is 11:16 pm (Mar 12) and the current time in Dennison is 12:16 am (Mar 13).

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Lowest Price Rental Cars in Roberts, MT

Planning on renting a car to go from Roberts, MT to Dennison, IL? 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 57.09 gallons of gas to cover the route between Roberts, MT and Dennison, IL.

The estimated cost of gas to go from Roberts to Dennison is $186.22.

During the route, an average car will release 1,118.46 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 Roberts, MT and Dennison, IL

If you want to meet halfway between Roberts, MT and Dennison, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.666332 and -97.175137, or 43º 39' 58.7952" N, 97º 10' 30.4932" W. This location is 710.74 miles away from Roberts, MT and Dennison, IL and it would take approximately 12 hours 45 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Montrose, SD, situated 680 miles from Roberts, MT and 745 miles from Dennison, IL. It would take 11 hours 50 mins to go from Roberts to Montrose and 13 hours 52 mins to go from Dennison to Montrose.

Major City Closest to Halfway Point

The major city closest to the halfway point between Roberts, MT and Dennison, IL is Sioux Falls, SD, situated 707 miles from Roberts, MT and 719 miles from Dennison, IL. It would take 12 hours 16 mins to go from Roberts to Sioux Falls and 13 hours 26 mins to go from Dennison to Sioux Falls.