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Distance from Roberts, MT to IAD Airport

Distance

1,946 mi

Time

1 day 11 hours

Gas Cost

$178 - $346

Helpful Inaccurate

There are 1,671.51 miles from Roberts to Washington Dulles International Airport (IAD) in southeast direction and 1,946 miles (3,131.78 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Roberts and IAD Airport are 1 day 11 hours far apart, if you drive non-stop .

This is the fastest route from Roberts, MT to IAD Airport. The halfway point is Dexter, MN.

Please note the time difference between Roberts, MT and IAD Airport is 2 hours. The current time in Roberts is 7:25 pm and the current time in IAD Airport is 9:25 pm.

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Lowest Price Rental Cars in Roberts, MT

Planning on renting a car to go from Roberts, MT to IAD Airport? 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 78.14 gallons of gas to cover the route between Roberts, MT and IAD Airport.

The estimated cost of gas to go from Roberts to IAD Airport is $250.37.

During the route, an average car will release 1,531.01 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 IAD Airport

If you want to meet halfway between Roberts, MT and IAD Airport or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.734432 and -92.666023, or 43º 44' 3.9552" N, 92º 39' 57.6828" W. This location is 972.90 miles away from Roberts, MT and IAD Airport and it would take approximately 17 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 Dexter, MN, situated 965 miles from Roberts, MT and 1,056 miles from IAD Airport. It would take 13 hours 59 mins to go from Roberts to Dexter and 16 hours 7 mins to go from IAD to Dexter.

Major City Closest to Halfway Point

The major city closest to the halfway point between Roberts, MT and IAD Airport is Rochester, MN, situated 991 miles from Roberts, MT and 1,040 miles from IAD Airport. It would take 14 hours 24 mins to go from Roberts to and 15 hours 54 mins to go from IAD to Rochester.