Oklahoma Freight RatesSurprisingly, Tulsa is home to an inland seaport that offers international freight shipping options. As the center of highway travel in the United States, Oklahoma shipping by truck is quite affordable. Several railroads also operate in the state, Oklahoma freight is an important part of the local economy. The agreeable landscape and winters keep carrier costs down. Because there is a large capacity of both inbound and outbound freight trucks, freight rates are great.