Distance between cities › USA › Illinois › Rio, IL › Distance from Rio to Roundup Book Hotels

Distance from Rio, IL to Roundup, MT

Distance

1,189 mi

Time

20 hours 53 mins

Gas Cost

$111 - $215

There are 974.46 miles from Rio to Roundup in northwest direction and 1,189 miles (1,913.51 kilometers) by car, following the I-90 route.

Rio and Roundup are 20 hours 53 mins far apart, if you drive non-stop .

This is the fastest route from Rio, IL to Roundup, MT.

Please note the time difference between Rio, IL and Roundup, MT is 1 hour. The current time in Rio is 7:49 am and the current time in Roundup is 6:49 am.

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Lowest Price Rental Cars in Rio, IL

Planning on renting a car to go from Rio, IL to Roundup, MT? Here there are some offers to rent a car in Rio, IL

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Rio »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 47.73 gallons of gas to cover the route between Rio, IL and Roundup, MT.

The estimated cost of gas to go from Rio to Roundup is $155.70.

During the route, an average car will release 935.17 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 Rio, IL and Roundup, MT

If you want to meet halfway between Rio, IL and Roundup, MT or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.752424 and -99.090887, or 43º 45' 8.7264" N, 99º 5' 27.1932" W. This location is 594.26 miles away from Rio, IL and Roundup, MT and it would take approximately 10 hours 26 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Pukwana, SD, situated 614 miles from Rio, IL and 578 miles from Roundup, MT. It would take 10 hours 55 mins to go from Rio to Pukwana and 10 hours 6 mins to go from Roundup to Pukwana.