Sloulin Field International Airport is located in Williston, North Dakota and services western North Dakota and eastern Montana. The Williston area offers excellent hunting, fishing, hiking, camping, and is part of the Lewis and Clark Trail. Williston is also located in the center of Bakken Shale Formation, the largest continous oil reserve ever assessed by the U.S. Geological Survey. Sloulin Fiel...d offers commercial airline service from Delta Air Lines and United Airlines. Signature Flight Support is the Fixed Based Operator that offers aircraft services, charter, and flight instruction. The City of Williston is currently in the process of relocating their entire airport to a location approximately 5 miles to the northwest.