Arrieta (17-6) struck out a season-high 12 and became the first 17-game winner in the big leagues by throwing baseball’s third no-hitter in less than three weeks.
The Astros right-hander Mike Fiers blanked the N.L. West-leading Dodgers, 3-0, on Aug. 21. Los Angeles had never been no-hit twice in a season.
Arrieta benefited from a close call by the official scorer in the third inning, when Kike Hernandez reached on an error by second baseman Starlin Castro.
Hernandez hit a one-hopper at Castro, who tried to play it on the short hop as the ball bounced off him. It was ruled an error but probably could have gone either way.
“I thought it was a hit,” Arrieta said. “Tough play. Hernandez hit it well. Tough short hop for Castro. They scored it an error, thankfully so, and I was able to finish it off.”
Hernandez reached second on a sacrifice before Arrieta struck out Jimmy Rollins to end the inning.
Carl Crawford nearly broke up the no-hit bid with two outs in the seventh, but Castro caught his line drive up the middle with a running grab.
“Lights-out defense,” Arrieta said.
With the Dodger Stadium crowd roaring, Arrieta struck out all three batters in the ninth — including Chase Utley on his 116th pitch to end it. Arrieta was mobbed by teammates near the mound, and they jumped their way in a huddle over to near the Cubs’ dugout, where they gave him high-fives.
“It went by so quick, really,” Arrieta said. “Feels like that could have been five innings, the way that played out.”
He was the first Cubs pitcher to throw a no-hitter since Carlos Zambrano on Sept. 14, 2008, against Houston in a game that was moved to Miller Park in Milwaukee because of Hurricane Ike.
Arrieta, a 29-year-old right-hander, walked one and helped the Cubs end a four-game skid on the last night of their six-game West Coast trip. He finished August with a 6-0 record, tying Boston’s Joe Kelly as the only pitchers with that many wins in the month.
Arrieta lowered his E.R.A. to 0.43 in August while becoming the first Cubs pitcher with that many wins in the month since Rick Sutcliffe in 1984. Sutcliffe won the N.L. Cy Young Award that season.
Kris Bryant hit a two-run homer in the first inning off Alex Wood. The Cubs had 13 hits and ended the Dodgers’ five-game winning streak.
Wood (9-9) allowed eight hits in six innings, striking out seven and walking one.
Hisashi Iwakuma of the Seattle Mariners pitched a no-hitter on Aug. 12 in a 3-0 win against Baltimore. Cole Hamels of Philadelphia, San Francisco’s Chris Heston and Washington’s Max Scherzer also have thrown no-hitters this season.
Arrieta threw a one-hit shutout against Cincinnati last Sept. 16 at Wrigley Field, allowing his first hit to Brandon Phillips with one out in the eighth.
Last year, Arrieta became the first Cubs pitcher since 1950 to take a no-hitter into the seventh inning three times in one season. Two of those came in consecutive starts, making him the first to do so since Toronto’s Dave Stieb in June 1988.