As of Week 4 in the 2025 NFL season, the only teams still undefeated are the Philadelphia Eagles and the Buffalo Bills, both holding a 4-0 record. The Eagles are the defending Super Bowl champions and have secured wins against tough opponents, including a comeback victory over the Rams and a win against the previously unbeaten Tampa Bay Buccaneers. The Bills also have a strong start, with quarterback Josh Allen leading them to four wins including a recent victory over the New Orleans Saints. Additionally, as of late Week 3, the Indianapolis Colts and San Francisco 49ers were undefeated at 3-0 but lost their games in Week 4, leaving only the Eagles and Bills undefeated after Week 4.
