The Chiefs are now one of just two unbeaten teams in the AFC following a 38-27 win Sunday over the San Francisco 49ers at Arrowhead Stadium.
Miami is the other 3-0 team in the conference.
The Chiefs scored touchdowns on all five of their first-half possessions before hitting a speed bump in the second half and being held to a field goal.
San Francisco dropped to 1-2, but rallied late to make it a close game. However, 49ers quarterback Jimmy Garoppolo was knocked out of the contest after a big hit on the sideline.