Distance between cities › USA › South Dakota › Selby, SD › Distance from Selby to Ralph Book Hotels

Distance from Selby, SD to Ralph, SD

Distance

188 mi

Time

4 hours 1 min

Gas Cost

$17 - $33

There are 147.74 miles from Selby to Ralph in west direction and 188 miles (302.56 kilometers) by car, following the US-12 and SD 20 route.

Selby and Ralph are 4 hours 1 min far apart, if you drive non-stop .

This is the fastest route from Selby, SD to Ralph, SD. The halfway point is Glad Valley, SD.

Please note the time difference between Selby, SD and Ralph, SD is 1 hour. The current time in Selby is 5:47 am and the current time in Ralph is 4:47 am.

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Lowest Price Rental Cars in Selby, SD

Planning on renting a car to go from Selby, SD to Ralph, SD? Here there are some offers to rent a car in Selby, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Selby »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 7.56 gallons of gas to cover the route between Selby, SD and Ralph, SD.

The estimated cost of gas to go from Selby to Ralph is $23.69.

During the route, an average car will release 148.07 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 $3.14 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Selby, SD and Ralph, SD

If you want to meet halfway between Selby, SD and Ralph, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 45.392502 and -101.647324, or 45º 23' 33.0072" N, 101º 38' 50.3664" W. This location is 94.09 miles away from Selby, SD and Ralph, SD and it would take approximately 2 hours to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Glad Valley, SD, situated 98 miles from Selby, SD and 87 miles from Ralph, SD. It would take 2 hours 26 mins to go from Selby to Glad Valley and 2 hours 23 mins to go from Ralph to Glad Valley.