Distance between cities › USA › South Dakota › Custer, SD › Distance from Custer to Washington Dulles International Airport Book Hotels

Distance from Custer, SD to IAD Airport

Distance

1,625 mi

Time

1 day 5 hours

Gas Cost

$149 - $289

Helpful Inaccurate

There are 1,389.61 miles from Custer to Washington Dulles International Airport (IAD) in southeast direction and 1,625 miles (2,615.18 kilometers) by car, following the I-90 and US-14 route.

Custer and IAD Airport are 1 day 5 hours far apart, if you drive non-stop .

This is the fastest route from Custer, SD to IAD Airport. The halfway point is Portage, WI.

Please note the time difference between Custer, SD and IAD Airport is 2 hours. The current time in Custer is 8:57 pm and the current time in IAD Airport is 10:57 pm.

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Lowest Price Rental Cars in Custer, SD

Planning on renting a car to go from Custer, SD to IAD Airport? 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 65.26 gallons of gas to cover the route between Custer, SD and IAD Airport.

The estimated cost of gas to go from Custer to IAD Airport is $209.09.

During the route, an average car will release 1,278.57 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 $3.20 per gallon of regular gas. Price last updated on March 11, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Custer, SD and IAD Airport

If you want to meet halfway between Custer, SD and IAD Airport or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.524094 and -89.553040, or 43º 31' 26.7384" N, 89º 33' 10.944" W. This location is 812.48 miles away from Custer, SD and IAD Airport and it would take approximately 14 hours 51 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Portage, WI, situated 780 miles from Custer, SD and 870 miles from IAD Airport. It would take 11 hours to go from Custer to Portage and 13 hours 36 mins to go from IAD to Portage.