Most average life flight or medical helicopters fly around 140 MPH which is the top speed they can reach which is important to be able to reach the patient or patient in need of a life flight helicopter.
Some other life flight helicopters such as the King Air helicopter can reach even higher speeds.
The King Air Helicopter can reach a top speed of 276 miles per hour and has a travel range of 1200 miles.
The higher speed helicopter is mostly used when it's gonna take longer with the average life flight helicopter to reach the patient or deliver the patient to a further away hospital that has better setups to take care of the patients needs.