Distance between cities › USA › South Dakota › Reliance, SD › Distance from Reliance to Gray Mountain Book Hotels

Distance from Reliance, SD to Gray Mountain, AZ

Distance

1,158 mi

Time

21 hours 19 mins

Gas Cost

$108 - $210

There are 842.62 miles from Reliance to Gray Mountain in southwest direction and 1,158 miles (1,863.62 kilometers) by car, following the I-70 route.

Reliance and Gray Mountain are 21 hours 19 mins far apart, if you drive non-stop .

This is the fastest route from Reliance, SD to Gray Mountain, AZ.

Please note the time difference between Reliance, SD and Gray Mountain, AZ is 2 hours. The current time in Reliance is 1:17 pm and the current time in Gray Mountain is 11:17 am.

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Lowest Price Rental Cars in Reliance, SD

Planning on renting a car to go from Reliance, SD to Gray Mountain, AZ? Here there are some offers to rent a car in Reliance, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Reliance »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 46.50 gallons of gas to cover the route between Reliance, SD and Gray Mountain, AZ.

The estimated cost of gas to go from Reliance to Gray Mountain is $151.69.

During the route, an average car will release 911.08 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 Reliance, SD and Gray Mountain, AZ

If you want to meet halfway between Reliance, SD and Gray Mountain, AZ or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 39.696683 and -105.753106, or 39º 41' 48.0588" N, 105º 45' 11.1816" W. This location is 578.96 miles away from Reliance, SD and Gray Mountain, AZ and it would take approximately 10 hours 39 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Silver Plume, CO, situated 570 miles from Reliance, SD and 588 miles from Gray Mountain, AZ. It would take 10 hours 13 mins to go from Reliance to Silver Plume and 11 hours 7 mins to go from Gray Mountain to Silver Plume.