Joseph Daniel Hudek IV was in first class and just exiting the restroom.
The flight was set to re-depart for Beijing again Thursday night.
Passengers who witnessed the incident said the man was pacing up and down the cabin aisle before attempting to open the exit door.
The FBI Seattle office said it is investigating.
"Somebody that was working had blood on their shirt", said Britteny Gardner, who was on the flight.
According to passenger Britteny Gardner, Delta crew asked passengers in the main cabin if there were any doctors on board.
He did not consume any other alcoholic beverages and did not appear intoxicated, according to the complaint.
Two flight attendants apparently tried to restrain him, and he punched one of them in the face twice.
The two anonymous sources also initially said that the Boeing 767 returned to the airport under a Department of Defense escort.
"We could see the scuffling going on when the flight attendance ran back and said there was a Code 3, there was a serious fight up front", said passenger Dustin Jones.
To Seattle returned a plane of Delta Airlines, with final destination in Beijing, when a first-class passenger attacked the flight attendant.
With the help of additional passengers, Hudek was ultimately subdued and handcuffed, but remained "extremely combative" during Flight 129's emergency return trip to Seattle-Tacoma International Airport.
Ayn Dietrich, an FBI spokeswoman, said the investigation was ongoing and more details would be provided in court.
"He started yelling for help", he told KIRO 7. He was screaming for people to help him.