are there any undefeated nfl teams

As of early October 2025, there are no undefeated NFL teams remaining in the 2025 regular season. The last undefeated teams, the Buffalo Bills and the Philadelphia Eagles, both lost their games by the end of Week 5, leaving no teams with a perfect record going into Week 6. The Bills lost to the New England Patriots on October 5, 2025, which eliminated the last unbeaten team from the season. This early absence of undefeated teams is notable and has only happened a few times in the Super Bowl era around this point in the season.