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

Distance from Webster, SD to Altamont, IL

Distance

845 mi

Time

15 hours 9 mins

Gas Cost

$79 - $153

There are 623.24 miles from Webster to Altamont in southeast direction and 845 miles (1,359.90 kilometers) by car, following the I-29 and US-81 route.

Webster and Altamont are 15 hours 9 mins far apart, if you drive non-stop .

This is the fastest route from Webster, SD to Altamont, IL. The halfway point is Amazonia, MO.

Webster, SD and Altamont, IL are in the same time zone (CDT). Current time in both locations is 8:43 am.

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Lowest Price Rental Cars in Webster, SD

Planning on renting a car to go from Webster, SD to Altamont, 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 33.92 gallons of gas to cover the route between Webster, SD and Altamont, IL.

The estimated cost of gas to go from Webster to Altamont is $110.65.

During the route, an average car will release 664.58 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 Altamont, IL

If you want to meet halfway between Webster, SD and Altamont, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 39.870537 and -94.831314, or 39º 52' 13.9332" N, 94º 49' 52.7304" W. This location is 422.32 miles away from Webster, SD and Altamont, IL and it would take approximately 7 hours 34 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Amazonia, MO, situated 444 miles from Webster, SD and 397 miles from Altamont, IL. It would take 6 hours 23 mins to go from Webster to Amazonia and 6 hours 4 mins to go from Altamont to Amazonia.