The halfway point between Spring Brook, North Dakota and Sloulin Field International Airport (defunct, closed in 2019) is:

Avoca, North Dakota

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Halfway between Spring Brook, ND and ISN

For a flight, the straight line geographic midpoint coordinates are 48° 12' 55" N and 103° 33' 2" W.

The city at the geographic halfway point from Spring Brook, ND to ISN is Avoca, North Dakota.

The closest zip code to the flight midpoint is 58802.

Halfway point calculator

Travelmath helps you figure out the midpoint between two locations based on the driving directions from each starting point. You can find the closest town that is an equal distance from two cities. Use this tool to determine the best city to meet, or to look for interesting stops along the way if you're planning a long road trip and you need to take a break or stay overnight. Search for hotels at the midpoint city to split up your drive, or explore other nearby cities and discover local towns on your trip. If you're meeting a friend halfway in-between, you can figure out how far each person has to drive and how long it will take to arrive at the center. Even if you're separated by water, you can still calculate the straight line geographic midpoint to determine the closest flight distance.