It was around 1:15 p.m. in the Mt. Chanin area of New Castle County when a car and a minivan collided.
Three people inside the car ended up trapped and had to be rescued by firefighters.
One was flown to a nearby hospital for treatment.
A man and a child in the minivan suffered injuries as well.
The accident occurred along the 200 block of West Rockland Road.
Officials say the windy road was wet at the time, though it has not yet been determined if the slick road played a part in the cause of the accident.
New Castle County police continue to investigate.