Is it illegal to transport a minor across state lines without parent's permission? Not technically, if they're under the age of 17 yes it is highly  illegal ANYWHERE. So long as the person is 17 it is legal, Title  18, chapter 117, section 2423 and 2422 of… the criminal code state;  . So long as age of consent is proportional to the ones age your  not taking part in a criminal offense so yes it is legal, its just  nice to let the parents know.