what nfl teams are still undefeated

The only two NFL teams that remain undefeated in the 2025 season through Week 4 are the Philadelphia Eagles and the Buffalo Bills. Both teams have a perfect 4-0 record. The Eagles, who are the defending Super Bowl champions, have secured impressive wins including a comeback victory over the Rams and a win against the previously unbeaten Tampa Bay Buccaneers. The Bills also have a strong start, recently defeating the New Orleans Saints to stay undefeated. Other teams that were previously undefeated, such as the Indianapolis Colts and San Francisco 49ers, have since lost their first games of the season.