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Distance from Boulder, MT to IAD Airport

Distance

2,125 mi

Time

1 day 14 hours

Gas Cost

$198 - $385

Helpful Inaccurate

There are 1,817.45 miles from Boulder to Washington Dulles International Airport (IAD) in southeast direction and 2,125 miles (3,419.86 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Boulder and IAD Airport are 1 day 14 hours far apart, if you drive non-stop .

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

Please note the time difference between Boulder, MT and IAD Airport is 2 hours. The current time in Boulder is 9:24 pm and the current time in IAD Airport is 11:24 pm.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to IAD Airport? Here there are some offers to rent a car in Boulder, MT

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Boulder »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 85.33 gallons of gas to cover the route between Boulder, MT and IAD Airport.

The estimated cost of gas to go from Boulder to IAD Airport is $278.34.

During the route, an average car will release 1,671.76 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 Boulder, MT and IAD Airport

If you want to meet halfway between Boulder, 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 43.650597 and -94.308311, or 43º 39' 2.1492" N, 94º 18' 29.9196" W. This location is 1,062.35 miles away from Boulder, MT and IAD Airport and it would take approximately 19 hours 20 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Granada, MN, situated 1,059 miles from Boulder, MT and 1,142 miles from IAD Airport. It would take 15 hours 30 mins to go from Boulder to Granada and 17 hours 34 mins to go from IAD to Granada.