Going undefeated in the NFL is a rare feat, with only the 1972 Miami Dolphins having accomplished a perfect regular season that culminated in a Super Bowl win. Still, every year, select teams make their case for why they could be next to reach perfection.
Can it happen in the 2026 season? Here's more information on who's undefeated heading into Week 6.
Which teams are 4-0?
Kansas City Chiefs (Bye week: Week 5)
Which teams are 5-0?
San Francisco 49ers (Bye week: Week 8)
Minnesota Vikings (Bye week: Week 6)