Delta spokeswoman Kate Modolo says the crew chose to divert the flight Saturday morning out of an abundance of caution after the pilots detected a smoky odor on board.
She says the 148 passengers are being placed on another flight and will arrive at New York La Guardia on Saturday afternoon.
Ryan McAdams is a spokesman for General Mitchell International Airport in Milwaukee. He says the flight landed safely at about 11:15 a.m.
Modolo says the source of the smoky odor is being investigated.