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

Distance from Webster, SD to Diamond, WY

Distance

686 mi

Time

12 hours 9 mins

Gas Cost

$64 - $124

There are 452.09 miles from Webster to Diamond in southwest direction and 686 miles (1,104.01 kilometers) by car, following the I-90 route.

Webster and Diamond are 12 hours 9 mins far apart, if you drive non-stop .

This is the fastest route from Webster, SD to Diamond, WY.

Please note the time difference between Webster, SD and Diamond, WY is 1 hour. The current time in Webster is 11:45 am and the current time in Diamond is 10:45 am.

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Lowest Price Rental Cars in Webster, SD

Planning on renting a car to go from Webster, SD to Diamond, WY? 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 27.54 gallons of gas to cover the route between Webster, SD and Diamond, WY.

The estimated cost of gas to go from Webster to Diamond is $89.85.

During the route, an average car will release 539.63 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 Diamond, WY

If you want to meet halfway between Webster, SD and Diamond, WY or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.836403 and -101.799122, or 43º 50' 11.0508" N, 101º 47' 56.8392" W. This location is 342.92 miles away from Webster, SD and Diamond, WY and it would take approximately 6 hours 4 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Cottonwood, SD, situated 350 miles from Webster, SD and 342 miles from Diamond, WY. It would take 6 hours 11 mins to go from Webster to Cottonwood and 6 hours 28 mins to go from Diamond to Cottonwood.