Jeremy Wuitschick, 13, was seen on CCTV video steering the bus to safety and then switching off the engine after it lost control on the outskirts of the town of Tacoma, reports Sky News.
As the boy brought the vehicle to a stop, a school official - who had seen the drama unfolding - pulled over and resuscitated the driver.
Police turned up soon after and escorted the 12 students off the bus.
"Everyone was asking questions," the 13-year-old said. "'What happened? Whoa there's a bus out there! What did you do Jeremy?'
"And I was just like, 'I just drove the bus to the side.' Everyone was excited about that."
The driver, who was rushed to hospital, has not been named and his condition is not known.
Jeremy now wants to take a CPR - cardiopulmonary resuscitation - course.
"When something major happens, I look back to see if there's something I could've done better," he said.
Grainy CCTV video grab of the 13-year-old boy at the steering wheel of the school bus after the driver collapsed
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