The man was arrested, and the woman was taken to a hospital for treatment of her injuries, said Alameda County Sheriff's Sgt. J.D. Nelson. Her condition was not known.

Darius Chappille, 21, of Jefferson City, Mo., who also has an Oakland address, was arrested and taken to Highland Hospital in Oakland for medical clearance. He was expected to be booked into Santa Rita Jail in Dublin.

Chappille had an outstanding arrest warrant on drug-related charges in Jefferson City, Nelson said.

Chappille and the female passenger apparently did not know each other, authorities said.

The incident happened aboard Southwest Flight 947, which has a scheduled departure from Oakland of 7:15 a.m. An e-mail account from a passenger on the flight, forwarded to The Chronicle, said the incident occurred about a half hour after takeoff.

Flight attendants subdued Chappille, pinning him face-down on the floor, and enlisted the help of passengers in case he tried to escape, the passenger said.

About 10 sheriff's deputies boarded the plane when it touched down in Oakland at 8:15 a.m., the e-mail message said, and Chappille was arrested without incident.

Southwest officials said the plane took off for Las Vegas again at 10 a.m. It was scheduled to continue on to St. Louis.

E-mail Michael Cabanat- uan at mcabanatuan@sfchronicle.com.