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

Distance from Webster, SD to Mount Vernon, IL

Distance

840 mi

Time

15 hours 7 mins

Gas Cost

$78 - $152

There are 656.32 miles from Webster to Mount Vernon in southeast direction and 840 miles (1,351.85 kilometers) by car, following the I-29 and US-81 route.

Webster and Mount Vernon are 15 hours 7 mins far apart, if you drive non-stop .

This is the fastest route from Webster, SD to Mount Vernon, IL.

Webster, SD and Mount Vernon, IL are in the same time zone (CDT). Current time in both locations is 3:46 pm.

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Lowest Price Rental Cars in Webster, SD

Planning on renting a car to go from Webster, SD to Mount Vernon, 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 33.74 gallons of gas to cover the route between Webster, SD and Mount Vernon, IL.

The estimated cost of gas to go from Webster to Mount Vernon is $110.07.

During the route, an average car will release 661.08 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 Mount Vernon, IL

If you want to meet halfway between Webster, SD and Mount Vernon, IL or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 39.934677 and -94.929362, or 39º 56' 4.8372" N, 94º 55' 45.7032" W. This location is 420.09 miles away from Webster, SD and Mount Vernon, IL and it would take approximately 7 hours 33 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 450 miles from Webster, SD and 391 miles from Mount Vernon, IL. It would take 7 hours 44 mins to go from Webster to Amazonia and 7 hours 29 mins to go from Mount Vernon to Amazonia.