Distance between cities › USA › Montana › Grass Range, MT › Distance from Grass Range to Union Star Book Hotels

Distance from Grass Range, MT to Union Star, MO

Distance

1,071 mi

Time

18 hours 56 mins

Gas Cost

$100 - $194

There are 860.37 miles from Grass Range to Union Star in southeast direction and 1,071 miles (1,723.61 kilometers) by car, following the I-29 route.

Grass Range and Union Star are 18 hours 56 mins far apart, if you drive non-stop .

This is the fastest route from Grass Range, MT to Union Star, MO.

Please note the time difference between Grass Range, MT and Union Star, MO is 1 hour. The current time in Grass Range is 4:12 am and the current time in Union Star is 5:12 am.

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Lowest Price Rental Cars in Grass Range, MT

Planning on renting a car to go from Grass Range, MT to Union Star, MO? Here there are some offers to rent a car in Grass Range, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Grass Range »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 43.03 gallons of gas to cover the route between Grass Range, MT and Union Star, MO.

The estimated cost of gas to go from Grass Range to Union Star is $140.37.

During the route, an average car will release 843.08 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 Grass Range, MT and Union Star, MO

If you want to meet halfway between Grass Range, MT and Union Star, MO or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.892298 and -101.118993, or 43º 53' 32.2728" N, 101º 7' 8.3748" W. This location is 535.75 miles away from Grass Range, MT and Union Star, MO and it would take approximately 9 hours 28 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Belvidere, SD, situated 512 miles from Grass Range, MT and 561 miles from Union Star, MO. It would take 9 hours 25 mins to go from Grass Range to Belvidere and 9 hours 34 mins to go from Union Star to Belvidere.