The 2025 NFL season is nearly 25 percent complete, as teams are playing their fourth game of a 17-game season during Week 4.
While some notable teams have stumbled out of the gates, a select few contenders have orchestrated flawless starts to the new season. Going undefeated may not be in the cards, but an undefeated season is not possible without a 4-0 start through four games.
The defending champion Philadelphia Eagles became the first team to reach four wins in 2025, earning a statement win over the previously undefeated Tampa Bay Buccaneers. Philly was quickly joined by the Buffalo Bills, who moved to 4-0 by holding off the feisty New Orleans Saints.
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Here is a look at the two remaining perfect NFL teams through Week 4, as the remaining undefeated teams suffered their first losses Sunday.
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NFL teams still undefeated
Philadelphia Eagles
The defending Super Bowl champs just keep finding ways to win.
Philadelphia's season already includes several statement wins, as it opened the season with a divisional win over the Dallas Cowboys before traveling to Kansas City to beat the Chiefs in Week 2. Weeks 3 and 4 have been just as thrilling, as the Eagles came back from 19 points down to hand the Rams their first loss, and followed that by staving off a comeback to hand the Buccaneers their first loss of the year.
Buffalo Bills
The Bills opened the season with a statement come-from-behind victory in primetime and have ridden that momentum through the next three weeks of the season. Buffalo avoided a letdown in Week 4, fending off New Orleans to earn a win.
It's early, but the Bills are helping themselves greatly in the uber-competitive AFC.
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