NotesThe Chiefs traded their fifth-round selection (No. 154 overall) to the New Orleans Saints in exchange for guard Ben Grubbs.
The Chiefs traded their 3rd round pick (80th overall) and their 6th round pick (193rd overall) to the Minnesota Vikings for their 3rd round pick (76th overall)
This list is for players who were involved in more than one transaction during the season
*Indicates player was signed off the practice squad of the team listed
Note: Intra-division opponents are in bold text.
With the win, the Chiefs started their 2015 campaign at 1-0.
The Broncos would score 2 touchdowns in the final minute to steal the win from the Chiefs. The second touchdown was a critical fumble by running back Jamaal Charles.
With the heartbreaking and stunning loss, the Chiefs fell to 1-1, and picked up their 7th straight loss to Denver.
In a rematch of the 2011 game, the Chiefs fell to 1-2.
Cairo Santos would kick 7 field goals in this game, setting a new franchise record for most field goals in one game by a Kansas City kicker. The 7 kicks also tied an NFL record. However, the 7 field goals by Santos were not enough to beat the Bengals, as the Chiefs fell to 1-3.
The Chiefs would build a 17-3 lead at one point, but Chicago would pull off a miraculous comeback to win 18-17. The Chiefs tried a 60-yard field goal, but Santos kick went wide right and missed everything near the goalposts. During this game, the Bears fans at times outnumbered the Chiefs fans, as Chicago fans are best known for good travel.
With the loss, Kansas City fell to 1-4. They would also lose Jamaal Charles for the season, as he tore his ACL in this game.
With their 5th straight loss, the Chiefs fell to 1-5.
Ben Roethlisberger would not play in this game for the Steelers, so backup quarterback Landry Jones led the way for the Steelers. In his first career start, the Chiefs defense would force 3 turnovers, 2 of them interceptions, and the Chiefs would hold on to win 23-13.
With the win, the Chiefs improved to 2-5.
NFL International Series
In their first ever game in London, the Chiefs routed the crestfallen 1-6 Detroit Lions. With the win, Kansas City improved to 3-5.
Broncos quarterback Peyton Manning would set the all-time record for most passing yards in NFL history in this game, but the Chiefs defense would have themselves a day, picking off Bronco quarterbacks 5 times, 4 by Manning, 1 by Brock Osweiler, and the Chiefs routed the Broncos, 29-13.
With the win, the Chiefs went to 4-5, and snapped their 7-game losing streak against the Broncos.
With the huge win, Kansas City went to 5-5, and climbed back into playoff contention.
With the win, Kansas City went to 6-5.
With the win, the Chiefs went to 7-5.
With the low-scoring win, the Chiefs went to 8-5 and swept the Chargers for the second straight season.
Rookie Marcus Peters would put the dagger into the Ravens, as he returned an interception 90 yards for a touchdown. With the win, the Chiefs went to 9-5.
The Browns, led by Johnny Manziel, tried to comeback to put a stop to Kansas City's playoff hopes, but Cleveland did not have any timeouts remaining, and they ultimately ran out of time when Manziel tried to get a spike down.
With the win, the Chiefs went to 10-5 and clinched a playoff spot.
With their 10th straight win, the Chiefs ended their season at 11-5. They were the first team to end a season with 10 or more consecutive wins since the 2012 Broncos won 11 in a row to end their season.
The Texans, who won the weak AFC South division with a 9–7 record, were completely crushed by the Chiefs. The Chiefs made postseason history as the first ever team to score a kick return touchdown in the opening play of the playoffs, when Knile Davis returned the opening kick 106 yards for a touchdown. After that, the game started to slow down, 3 and out Texans, 3 & out Chiefs, followed by a string of turnovers, Eric Berry's interception of Brian Hoyer, Brian Cushing's interception of Alex Smith two plays later, and a Hoyer fumble recovered by Dontari Poe on the ensuing drive. The Chiefs made a field goal on the drive, and although the team was able to get to the 2 yard line, a negative run by J. J. Watt and another interception by Hoyer ended the Texans' closest chance at scoring in the entire game. Although the Texans' defense forced a 3-and-out, Hoyer threw his third interception to Marcus Peters on the second play of their drive.
The Chiefs, who had won 11 straight, travelled to Gillete Stadium to face the Patriots, who had advanced to the AFC Championship for the last 5 years. The Patriots scored first blood with a Rob Gronkowski touchdown catch, followed by a Cairo Santos field goal for Kansas City. The pattern was duplicated in the 2nd quarter, with Tom Brady rushing for a score before Santos kicked another field goal. In the 3rd quarter, after Gronkowski scored his second TD, Alex Smith threw his first to Albert Wilson. The Patriots responded with 2 fourth quarter field goals to make the score 27-13 with 10:20 left. Although the Chiefs go on a touchdown drive late in the game, the drive took up over 5 minutes, and the Chiefs had to force a 3 and out (with 3 timeouts) to have a chance. On 2nd down, when Brady threw the ball instead of running it to waste time, the ball was batted and miraculously caught by Julian Edelman for a 1st down, ending the game.