The 2018 season was the Kansas City Chiefs' 49th in the National Football League (NFL), their 59th overall, their sixth under head coach Andy Reid, and their second under general manager Brett Veach.

[1] In the offseason the Chiefs had several major changes, including trading 2-time Pro Bowler Marcus Peters, as well as Alex Smith.

The team also voided the final year of the contract of their longest tenured player Derrick Johnson and they released long time linebacker Tamba Hali.

A Week 14 win over the Baltimore Ravens clinched the Chiefs' fourth consecutive playoff appearance.

After defeating their rival, the Oakland Raiders 35–3 in Week 17, the Chiefs clinched their third consecutive division title and home-field advantage throughout the playoffs for the first time since 1997.

[2] In the playoffs, the Chiefs advanced to the AFC Championship Game for the first time since 1993 by defeating the Indianapolis Colts, 31–13 in the divisional round.

In the AFC Championship Game, the Chiefs lost to the eventual Super Bowl champion New England Patriots, 37–31 in overtime.

With this win, head coach Andy Reid eclipsed win number 200, becoming the seventh coach in NFL history to do so (with Don Shula, George Halas, Bill Belichick, Tom Landry, Curly Lambeau, & Marty Schottenheimer).