The injured wife of a man killed in the Westminster terror attack has flown home to the US.

Melissa Cochran, 46, suffered a broken leg and rib and a cut to her head after Khalid Masood drove into pedestrians on Westminster Bridge on March 22, BBC reports. 

He killed four people, including her husband Kurt, 54, before stabbing a policeman to death outside Parliament.

The couple, from Salt Lake City, Utah, had been visiting London to celebrate their 25th wedding anniversary.

Doctors cleared Mrs Cochran to fly back home last week, her brother Clint Payne said.

He added that Mrs Cochran, who was in a wheelchair when she joined a service for the families and survivors of the attack at Westminster Abbey on 5 April, was healing faster than expected.