The Kansas City Chiefs most recently lost to the Las Vegas Raiders , 14–12, in Week 18 of the 2025 NFL season.

Quick Scoop: What game this refers to

When people currently ask “who did the Chiefs lose to,” they’re usually talking about their latest game, which was the regular-season finale of 2025.

In that matchup, Kansas City fell on the road to the Raiders in Las Vegas, closing the year with a 6–11 record.

Key details from that loss

  • Final score: Raiders 14, Chiefs 12.
  • Location: Allegiant Stadium, Las Vegas (Week 18, 2025 season).
  • Stakes: The loss locked the Chiefs into a 6–11 finish and bumped them to ninth in the 2026 NFL Draft order.
  • Game flow:
    • Kansas City’s defense played well, holding Las Vegas to just 204 total yards, but the offense struggled badly.
* A late 21‑yard completion from Aidan O’Connell to Michael Mayer helped set up Daniel Carlson’s career‑long 60‑yard field goal, which proved decisive.

In short: the answer to “who did the Chiefs lose to” (most recently) is the Las Vegas Raiders, in that 14–12 road defeat to end their 2025 season.

Information gathered from public forums or data available on the internet and portrayed here.