Interstate 90 (I-90) is a transcontinental freeway, and the longest Interstate Highway in the United States at 3,020.54 miles (4,861.09 km). Its western terminus is in Seattle, at Edgar Martinez Drive S. near Safeco Field and CenturyLink Field, and its eastern terminus is in Boston, Massachusetts, at Route 1A near Logan International Airport. I-90 crosses the Continental Divide over Homestake Pass just east of Butte, Montana.