Distance between cities › USA › Illinois › Speer, IL › Distance from Speer to Castleton Book Hotels

Distance from Speer, IL to Castleton, IL

Distance

14 mi

Time

29 minutes

Gas Cost

$1 - $3

There are 9.40 miles from Speer to Castleton in northwest direction and 14 miles (22.53 kilometers) by car, following the IL 40 route.

Speer and Castleton are 29 minutes far apart, if you drive non-stop .

This is the fastest route from Speer, IL to Castleton, IL. The halfway point is Camp Grove, IL.

Speer, IL and Castleton, IL are in the same time zone (CDT). Current time in both locations is 8:43 pm.

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Lowest Price Rental Cars in Speer, IL

Planning on renting a car to go from Speer, IL to Castleton, IL? Here there are some offers to rent a car in Speer, IL

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Speer »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 0.56 gallons of gas to cover the route between Speer, IL and Castleton, IL.

The estimated cost of gas to go from Speer to Castleton is $2.03.

During the route, an average car will release 11.05 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 $3.60 per gallon of regular gas. Price last updated on March 11, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Speer, IL and Castleton, IL

If you want to meet halfway between Speer, IL and Castleton, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 41.075813 and -89.634216, or 41º 4' 32.9268" N, 89º 38' 3.1776" W. This location is 7.02 miles away from Speer, IL and Castleton, IL and it would take approximately 14 minutes to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Camp Grove, IL, situated 8 miles from Speer, IL and 7 miles from Castleton, IL. It would take 13 minutes to go from Speer to Camp Grove and 17 minutes to go from Castleton to Camp Grove.