Anthony Rizzo went 2 for 4 with two RBIs, Victor Caratini went 3 for 3, and Jason Heyward and Albert Almora Jr. each had an RBI single for Chicago.
Arrieta (13-8) allowed one run and six hits in 6 1/3 innings to win his third straight start. Wade Davis got the final three outs for his 25th save.
Ryan Goins had a two-run single and Kevin Pillar added an RBI double to highlight a three-run eighth for the Blue Jays. Miguel Montero, who began the season with the Cubs, went 2 for 4 with a run scored against his former team.
