United Airlines baggage policy is designed to accommodate a variety of travel needs, offering flexibility depending on location, class of travel, and frequent flyer status. Each passenger is allowed one free personal item (17 x 10 x 9 inches) and one carry-on bag (22 x 14 x 9 inches). One or two complimentary checked bags may be offered on international flights, depending on the ticket class. The first luggage costs $35 and the second bag costs $45 on domestic flights. Overweight or oversized luggage incurs additional penalties of $100 to $200. For the most up-to-date and accurate information, passengers should visit United Airlines' official website or contact customer service before leaving.