The bus overturned Wednesday afternoon in Bonner Springs while carrying students from Pembroke Hill School, a private school in nearby Kansas City, Mo.
School spokeswoman Beth Bryant says eight sixth-grade girls were hurt but that no one suffered life-threatening injuries.
Bryant says the bus was carrying 30 sixth-grade girls to a campout when it crashed along a ramp connecting Kansas 7 and Kansas 32. She says the other 22 girls were being taken to a local high school to be picked up by their parents.
Television images showed the bus on its side, with paramedics placing children on stretchers.
Bonner Springs is about 18 miles west of Kansas City, Mo.