Reigning Premier League champion City scored goals 54 seconds apart in the first half and 71 seconds apart in the second half to dominate the fixture, part of a US pre-season tour for both clubs.
Haaland wore the captain's armband and showed a crowd of 71,280 why he is considered among the world's best players.
The 24-year-old Norwegian striker scored on a penalty kick in the fourth minute and, after a Moises Caicedo give away in the Chelsea half, smashed a right-footed shot into the right corner for a 2-0 City lead in the fifth minute -- only 17 seconds after the restart.
Oscar Bobb boosted the lead to three in the 55th minute, taking the ball down the right wing and cutting inside to fire a left-footed shot past a defender and just inside the near post.
Haaland then completed his hat trick in the 56th minute after City forced a turnover in Chelsea territory.
Haaland took a pass at the top of the box between two defenders and flicked in a left-footed shot for a 4-0 City edge only 25 seconds after the restart.
Raheem Sterling answered for Chelsea in the 59th minute and Noni Madueke added a final goal in the 89th but it was too little and too late.
The game was a preview of the start to the 2024-25 Premier League campaign for both clubs. Manchester City will open the season against Chelsea on August 18.
Liverpool beats Man Utd
In another pre-season US showdown of English giants, Liverpool blanked Manchester United 3-0 before 77,559 spectators at Columbia, South Carolina.
Fabio Carvalho, a 21-year-old Portuguese striker, opened the scoring for Liverpool in the 10th minute.
In the 36th minute, Egyptian striker Mo Saleh got to the backline and fired a perfect centering pass to onrushing Curtis Jones, who tapped in with his left foot for a 2-0 Liverpool lead.
Greek standout Kostas Tsimikas gave the Merseysiders a 3-0 edge in the 61st minute, knocking in a rebound off the left post.
