Distance between cities › USA › Ohio › Cincinnati, OH › Distance from Cincinnati to Harmon Book Hotels

Distance from Cincinnati, OH to Harmon, IL

Distance

398 mi

Time

7 hours 34 mins

Gas Cost

$37 - $72

There are 321.04 miles from Cincinnati to Harmon in northwest direction and 398 miles (640.52 kilometers) by car, following the I-74 route.

Cincinnati and Harmon are 7 hours 34 mins far apart, if you drive non-stop .

This is the fastest route from Cincinnati, OH to Harmon, IL. The halfway point is Danville, IL.

Please note the time difference between Cincinnati, OH and Harmon, IL is 1 hour. The current time in Cincinnati is 5:47 am and the current time in Harmon is 4:47 am.

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Lowest Price Rental Cars in Cincinnati, OH

Planning on renting a car to go from Cincinnati, OH to Harmon, IL? Here there are some offers to rent a car in Cincinnati, OH

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Cincinnati »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 15.98 gallons of gas to cover the route between Cincinnati, OH and Harmon, IL.

The estimated cost of gas to go from Cincinnati to Harmon is $52.12.

During the route, an average car will release 313.06 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 Cincinnati, OH and Harmon, IL

If you want to meet halfway between Cincinnati, OH and Harmon, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 40.110561 and -87.540627, or 40º 6' 38.0196" N, 87º 32' 26.2572" W. This location is 198.94 miles away from Cincinnati, OH and Harmon, IL and it would take approximately 3 hours 47 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Danville, IL, situated 197 miles from Cincinnati, OH and 199 miles from Harmon, IL. It would take 3 hours 17 mins to go from Cincinnati to Danville and 3 hours 32 mins to go from Harmon to Danville.