A drunken wrong-way driver with a switchblade in her purse was busted near LaGuardia Airport over the weekend, law-enforcement sources said Monday.

Chelsea Sanchez, 24, of Brooklyn was driving a Ford Explorer with Florida plates when she was pulled over around 11:10 a.m. Saturday by Port Authority police for heading the wrong way on LaGuardia Road, sources said.

Her eyes “were watery, and when talking, her speech was slurred,” a source said.

Her clothing was also “in disarray, and she was unsteady on her feet” when the officers asked her to step out of the SUV, the source said.

A check of her license show it had been suspended, and when she was arrested, a search of her purse revealed she was carrying the knife, which she told cops she carried “for protection,” sources said.

Sanchez was charged with a DWI, criminal possession of a weapon and for aggravated unlicensed operation of a car.