The strong viewership capped what analysts said was a solid run for the tournament's broadcasters, with Fox and Comcast paying roughly $485 million and $600 million, respectively, for rights packages that included the World Cup, according to media reports.
Several knockout-stage matches also outperformed recent championship games in major U.S. sports. The Round of 16 meeting between England and Mexico drew nearly 45 million viewers, well above the roughly 27 million who watched Game 7 of Major League Baseball's World Series, when the Los Angeles Dodgers beat the Toronto Blue Jays in extra innings, and the nearly 25 million who tuned in for Game 5 of the NBA Finals, where the New York Knicks ended a 53-year title drought by defeating the San Antonio Spurs.
While the figures remained below the nearly 126 million viewers who watched Super Bowl LX, when the Seattle Seahawks defeated the New England Patriots, they marked a significant milestone for a sport long overshadowed in the United States by American football, basketball and baseball.
The tournament, co-hosted by the U.S., Canada and Mexico for the first time, has benefited from prime-time kickoff slots for American audiences. Fans were also drawn by what could be the final World Cup appearances of a generation's biggest stars, including Argentina's Lionel Messi and his long-time Portuguese rival Cristiano Ronaldo.
Fox One, which had the English-language streaming rights in the U.S., recorded 2.8 million sign-ups in June, its strongest month since the service's launch last August and more than double the 1.1 million sign-ups generated during NFL Playoffs in January, according to industry tracker Antenna.
Soccer's popularity among Hispanic audiences also drove strong turnout on Spanish-language broadcaster Telemundo.
"Ratings have blown past internal forecasts for both networks, and it's not close," said Vicente Navarro, managing partner at soccer-focused marketing firm GotDigital.
Navarro said a marquee 30-second advertising spot in the knockout-stage matches cost as much as $1 million, more than double 2018 levels. Major advertisers included PepsiCo, Home Depot, Anheuser-Busch and Coca-Cola, according to market intelligence firm SensorTower.
For comparison, a 30-second Super Bowl advertisement typically costs about $8 million or more.