Phone Numbers
- Mileage Plus800-421-4655
- Post Travel Customer Service877-624-2660
- International Flights800-538-2929
- Customer Service800-241-6522
- Reservations800-225-8900
- Baggage/Luggage Problems800-335-2247
- Corporate Offices312-997-8000
- Member Services866-822-5827
- Corporate Offices847-700-4000
- Customer Service800-231-0856