Los Angeles: A girl suffered a medical emergency and died on a flight out of Los Angeles International Airport headed to Seattle, officials said.

"Delta Air Lines Flight 2423 to Seattle returned to LAX because of a passenger medical emergency," Federal Aviation Administration spokesman Ian Gregor said.

The Delta aircraft returned to Los Angeles International Airport after the girl suffered a medical emergency. Credit:AFP

Paramedics responded to the gate at 5.53pm on Thursday and "furiously worked to save her life," according to the Los Angeles Fire Department.

"Sadly, all efforts were futile and the child was beyond medical help," LAFD spokeswoman Margaret Stewart said. The girl was pronounced dead at the scene.