Distance between cities › USA › South Dakota › Custer, SD › Distance from Custer to Avant Book Hotels

Distance from Custer, SD to Avant, OK

Distance

838 mi

Time

15 hours 58 mins

Gas Cost

$78 - $152

There are 640.77 miles from Custer to Avant in southeast direction and 838 miles (1,348.63 kilometers) by car, following the I-80 route.

Custer and Avant are 15 hours 58 mins far apart, if you drive non-stop .

This is the fastest route from Custer, SD to Avant, OK. The halfway point is Burbank, SD.

Please note the time difference between Custer, SD and Avant, OK is 1 hour. The current time in Custer is 1:20 am and the current time in Avant is 2:20 am.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to Avant, OK? Here there are some offers to rent a car in Custer, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Custer »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 33.66 gallons of gas to cover the route between Custer, SD and Avant, OK.

The estimated cost of gas to go from Custer to Avant is $109.81.

During the route, an average car will release 659.54 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 Custer, SD and Avant, OK

If you want to meet halfway between Custer, SD and Avant, OK or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 42.758274 and -96.749901, or 42º 45' 29.7864" N, 96º 44' 59.6436" W. This location is 419.11 miles away from Custer, SD and Avant, OK and it would take approximately 7 hours 59 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Burbank, SD, situated 441 miles from Custer, SD and 547 miles from Avant, OK. It would take 6 hours 4 mins to go from Custer to Burbank and 8 hours 39 mins to go from Avant to Burbank.