If you are still at the airport after a United Airlines trip and find that your checked bag was lost, damaged, or delayed, go to the Baggage Service Office for help. Call united airlines helpline number 1-800-335-2247 to reach the United Baggage Resolution Service Center if you've already left the airport. Call 1-281-821-3526 if you are outside the U.S. or Canada. Within twenty-four hours of returning from a journey within the United States, including to Puerto Rico, Guam, and the Virgin Islands of the United States, you are required to report any problems with your luggage. For foreign flights, you have a week to report lost bags and 21 days to report late bags.