Ismaaiyl Brinsley made a flurry of final phone calls before he gunned down two NYPD ­officers Saturday, law-enforcement sources told The Post.

Brinsley, 28, had shot his ex-girlfriend in the stomach near Baltimore before hopping a Bolt bus to New York with her stolen cellphone, the sources said.

He arrived on West 34th Street in Manhattan four hours before the 2:47 p.m. shooting, and traveled by subway up to 42nd Street, then reached the Atlantic Terminal Mall in Brooklyn at around 12:07 p.m., police said.

He used the cellphone to call his estranged mother and sister, as well as a friend from jail and a woman he knew from Brooklyn, sources said.

A surveillance image of him making one of the calls is the last known photo of him.

Brinsley ditched the phone behind a radiator, strolled to the Marcy Houses in Bed-Stuy and shot the officers a block away on Tompkins Avenue near Myrtle Avenue.

Investigators are now following the money trail after Brinsley, 28, got change for a $100 bill in Maryland before fleeing to New York, ­police sources said.

“Where did he get his money, who does he hang out with?” Police Commissioner Bill Bratton said on CBS’s “This Morning,” referring to Brinsley as a “couch crasher.”