Distance between cities › USA › Montana › Boulder, MT › Distance from Boulder to Avon Book Hotels

Distance from Boulder, MT to Avon, IL

Distance

1,389 mi

Time

1 day

Gas Cost

$129 - $252

There are 1,149.49 miles from Boulder to Avon in southeast direction and 1,389 miles (2,235.38 kilometers) by car, following the I-90 and US-14 and US-16 Truck and SD 79 route.

Boulder and Avon are 1 day far apart, if you drive non-stop .

This is the fastest route from Boulder, MT to Avon, IL. The halfway point is Okaton, SD.

Please note the time difference between Boulder, MT and Avon, IL is 1 hour. The current time in Boulder is 12:02 am and the current time in Avon is 1:02 am.

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Lowest Price Rental Cars in Boulder, MT

Planning on renting a car to go from Boulder, MT to Avon, IL? 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 55.76 gallons of gas to cover the route between Boulder, MT and Avon, IL.

The estimated cost of gas to go from Boulder to Avon is $181.91.

During the route, an average car will release 1,092.55 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 Avon, IL

If you want to meet halfway between Boulder, MT and Avon, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.879490 and -100.915092, or 43º 52' 46.164" N, 100º 54' 54.3312" W. This location is 694.27 miles away from Boulder, MT and Avon, IL and it would take approximately 12 hours 23 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Okaton, SD, situated 723 miles from Boulder, MT and 719 miles from Avon, IL. It would take 10 hours 59 mins to go from Boulder to Okaton and 10 hours 39 mins to go from Avon to Okaton.