David Ludwig did not fight efforts to return him to Pennsylvania. A Pennsylvania judge ordered him held without bail. He was not represented by a lawyer at the arraignment. A preliminary hearing was set for Nov. 23.
His 14-year-old girlfriend, Kara Beth Borden, was returned home on a separate plane. She was not under arrest.
Indiana police captured Ludwig on Monday after the car he was driving slammed into a tree during a chase. He is suspected of shooting Kara's parents, both 50, in their Lititz home early Sunday after an argument over the teens' relationship.
Warwick Township Chief Richard F. Garipoli Jr. said Kara will be considered a victim in the case — rather than a willing participant — "until I hear otherwise."
Ludwig and Borden were both home-schooled teenagers from Lititz, a small town in Amish country about an hour west of Philadelphia.
Garipoli tells CBS News that the 14-year-old girl who was found in Indiana with an 18-year-old accused of killing her parents and abducting her is "doing OK."
"Kara's upset, she's crying. She's a 14-year-old child and we seem to forget that. She's devastated. So it's important that we do put her back with her family where she belongs," Garipoli said.
Garipoli also told The Early Show co-anchor Julie Chen that murder suspect David Ludwig is "being very quiet" and seems to be in a state of shock.
Police say Ludwig killed Borden's parents, Michael F. and Cathryn Lee Borden, early Sunday after an argument about her curfew when she came home late. The shootings happened at the family's home near Lititz, Pa., about 60 miles west of Philadelphia.
He faces preliminary charges in Indiana of criminal recklessness and resisting law enforcement, authorities said. Police in Pennsylvania issued an arrest warrant on charges of criminal homicide and kidnapping.
Few details were known about the pair's trip. Authorities said they don't know the route they traveled, if they had family or friends in Indiana or if they were simply passing through the state.
The Bordens, both 50, were apparently shot once each in the head, authorities said. Mike Borden worked for a printing company, said neighbor Tod Sherman.