The woman and her male friend were on-board Thai AirAsia (TAA) flight, bound for Nanjing in east China, with 174 passengers and four cabin crew yesterday evening when the incident happened.
The couple, part of a group tour, was apparently angry at not being seated together.
The woman bought a bowl of noodles and asked for hot water, which she reportedly splashed on the flight attendant's face.
"The captain of the flight decided to return the plane to Don Mueang Airport deeming her actions as endangering to other passengers and impeding in-flight service," the statement added.
Eyewitnesses said after the verbal spat with the cabin crew the man threatened to blow up the plane, while his girlfriend said she wanted to kill herself.
The incident forced the captain to return to Don Mueang airport and the couple were asked to disembark.
Police later took the couple and their two friends to Don Muang police station where they settled the dispute with the flight attendant and the captain.
The TAA cabin attendant was not seriously injured. She had been treated and was now "okay".
Chinese tourist overseas have developed a reputation for bad behavior, so much so that Chinese government has drawn up a list of do's and don'ts for its citizens travelling abroad that include guidelines against spitting in public, allowing children to defecate in public and spitting publicly.
During a recent trip to Maldives, China's President Xi Jinping has also asked his fellow countrymen not to behave improperly while abroad.
