'Teammates let him down': Josh Allen left 'crushed' after another loss to Kansas City

The heartbroken Buffalo Bills ought to be getting used to this by now - but that surely doesn't make it any easier.

Despite another gutsy effort from Josh Allen, they were forced to watch in the closing seconds as Patrick Mahomes and the rest of their biggest rivals closed out a 32-29 victory in the AFC championship game on Monday (AEDT).

For the fourth time in the last five years, the Chiefs ended Buffalo's post-season.

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“It's not fun," Allen said post-game.

"To be the champs, you have to beat the champs, and we didn't do it tonight.”

Kansas City will head to New Orleans and try to become the first team in NFL history to win three consecutive Super Bowls, while the Bills headed back to Buffalo, where they will rue another missed chance at their first trip to the big game since January 1994.

“They played as a team,” Bills head coach Sean McDermott said.

“They gave everything they had. It just wasn't enough, again. I told them they've got nothing to be ashamed of and I love them."

Allen did about everything he could, moving the Bills downfield in the second half and trying to answer every Kansas City score with one of his own.

He finished with 237 yards passing and two touchdowns without an interception.

But the Bills' defence, which was missing Taylor Rapp and Christian Benford on the back end due to injuries, was unable to make a play when it mattered, and Mahomes marched Kansas City within range of Harrison Butker's go-ahead field goal.

Even then, the Bills had an opportunity to win. They took over with 3:33 left and Allen soon picked up a first down with a 13-yard scramble.

But his next two passes were batted down at the line of scrimmage, and a short throw to Amari Cooper on third down could have been so much more if not for a shoestring tackle that brought up fourth down.

As the Chiefs often do under defensive coordinator Steve Spagnuolo, they brought a heavy blitz, and Allen had to backpedal away from defenders.

He threw up a wobbly prayer deep downfield, and it was nearly answered by tight end Dalton Kincaid, who just missed hauling it in to keep their hopes alive.

The defending champs took over, ran out the clock and were ready to take their party to the Big Easy to face the Philadelphia Eagles.

“We had a chance with the ball in our hands, in Josh’s hands, to win it, and we came up a little bit short right there,” McDermott said.

“I thought we had a chance to catch the ball."

In the Bills' last eight games against Kansas City, they have won every one in the regular season, including in week 11 this season.

But in all four matches in the post-season, it's been the Chiefs left standing at the end.