Four skydivers and a pilot had a lucky escape after their plane crashed into a house in Arizona and burst into flames.

An aircraft mechanic who witnessed the smash said the small Cessna 182 was in trouble before it ploughed into the property in Gilbert, Maricopa County.

Abdul Khan said the loud noise he heard from the single-engine plane told him something was terribly wrong.

"This one started coming down like a big ball," he said.

"It went flat for a little bit and then started nose-diving. It was so close we thought it was going to come into our house. When it came down, it made a big noise."

The skydivers, who were preparing to jump into an annual event to celebrate the adoption of the US constitution, and the pilot, leapt from the aircraft and parachuted to safety before it crashed, completely destroying the house.

A husband and wife who were indoors when the plane hit on Saturday evening made it out safely and were not injured.

The pilot suffered minor burns and was being treated at a local hospital.