United Airlines Reservations Phone Number: Book Flights by Phone
Booking a United Airlines flight by phone is one of the fastest ways to lock in seats, apply MileagePlus benefits, and resolve complex itineraries — especially when you have multiple travelers, special requests, or need same-day changes.
Why call United Airlines reservations?
Speaking with a live agent removes the guesswork from online booking. Whether you''re flying domestic, international, or using award miles, a phone agent can:
- Search multi-city and open-jaw itineraries the website hides
- Apply travel credits, eVouchers, and companion certificates
- Combine MileagePlus miles with cash for upgrades
- Resolve schedule changes and involuntary rebookings
- Add infants, pets, unaccompanied minors, and special meals
What to have ready before you call
To shorten your call, keep these details nearby:
1. Full passenger names (exactly as on government ID) 2. Travel dates and preferred airports 3. MileagePlus number 4. Payment method 5. Any travel credits or certificate numbers
Best times to call
Early mornings (6–9 AM local) and late evenings tend to have the shortest hold times. Avoid Monday mornings and Sunday evenings when call volume peaks.
Booking changes and cancellations
Most United tickets (except Basic Economy) allow free changes on domestic and short-haul international itineraries. A phone agent can waive fees in specific scenarios, including weather disruptions and schedule changes greater than two hours.
Ready to book?
If you''d rather skip the queue, our reservations line connects you with a live booking specialist 24/7 to find the best fare and seat for your trip.
Ready to book? Call (866) 332-0535
Speak to a USA-based flight booking specialist in under a minute.