Distance between cities › USA › South Dakota › Webster, SD › Distance from Webster to Adair Book Hotels

Distance from Webster, SD to Adair, IL

Distance

663 mi

Time

12 hours 6 mins

Gas Cost

$62 - $120

There are 491.28 miles from Webster to Adair in southeast direction and 663 miles (1,067.00 kilometers) by car, following the I-29 and US-81 route.

Webster and Adair are 12 hours 6 mins far apart, if you drive non-stop .

This is the fastest route from Webster, SD to Adair, IL. The halfway point is Walnut, IA.

Webster, SD and Adair, IL are in the same time zone (CDT). Current time in both locations is 8:39 am.

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Lowest Price Rental Cars in Webster, SD

Planning on renting a car to go from Webster, SD to Adair, IL? Here there are some offers to rent a car in Webster, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Webster »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 26.61 gallons of gas to cover the route between Webster, SD and Adair, IL.

The estimated cost of gas to go from Webster to Adair is $86.80.

During the route, an average car will release 521.36 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 Webster, SD and Adair, IL

If you want to meet halfway between Webster, SD and Adair, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 41.492268 and -95.161461, or 41º 29' 32.1648" N, 95º 9' 41.2596" W. This location is 331.30 miles away from Webster, SD and Adair, IL and it would take approximately 6 hours 3 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Walnut, IA, situated 343 miles from Webster, SD and 315 miles from Adair, IL. It would take 4 hours 50 mins to go from Webster to Walnut and 5 hours 20 mins to go from Adair to Walnut.