United Airlines carry-on size, no larger than 9 inches by 14 inches by 22 inches (22 cm by 35 cm by 56 cm), is permitted for Economy travellers on United Airlines. This bag ought to fit in the bin above. Travellers are also permitted to bring one personal item, which must fit under the seat, such as a laptop bag or pocketbook. There may be additional or differing allowances for guests in premium cabins. For up-to-date and accurate information on United Airlines’ carry-on size limitations, visit their official website or get in touch with them directly. Keep in mind that these guidelines are subject to change.