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

Distance from Roberts, MT to Declo, ID

Distance

450 mi

Time

8 hours 23 mins

Gas Cost

$42 - $82

There are 296.20 miles from Roberts to Declo in southwest direction and 450 miles (724.20 kilometers) by car, following the US-191 route.

Roberts and Declo are 8 hours 23 mins far apart, if you drive non-stop .

This is the fastest route from Roberts, MT to Declo, ID. The halfway point is West Yellowstone, MT.

Roberts, MT and Declo, ID are in the same time zone (MDT). Current time in both locations is 1:27 am.

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Lowest Price Rental Cars in Roberts, MT

Planning on renting a car to go from Roberts, MT to Declo, ID? 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 18.06 gallons of gas to cover the route between Roberts, MT and Declo, ID.

The estimated cost of gas to go from Roberts to Declo is $58.92.

During the route, an average car will release 353.89 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 Declo, ID

If you want to meet halfway between Roberts, MT and Declo, ID or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 44.909115 and -111.054695, or 44º 54' 32.814" N, 111º 3' 16.902" W. This location is 224.88 miles away from Roberts, MT and Declo, ID and it would take approximately 4 hours 11 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is West Yellowstone, MT, situated 248 miles from Roberts, MT and 226 miles from Declo, ID. It would take 4 hours to go from Roberts to West Yellowstone and 3 hours 46 mins to go from Declo to West Yellowstone.