Wang Lin Jia and Ye Meng Yuan, both 16, and 15-year old Liu YiPeng were killed in the July 6 accident.
Their families left San Francisco around noon Saturday on a flight to Shanghai, with the ashes of their daughters.
The families have retained a New York law firm to represent them.
Dozens were seriously injured in the crash of Asiana Flight 214, which had 307 people aboard when it hit a seawall in front of the runway, lost its tail, and caught fire.
The NTSB continues to investigate the crash.