Urgency can arise anytime, so you call United agent to change flight. An executive is assigned to listen to all the queries and assist. However, there is a way to make a call, for you are suggested to go through the discussion to know it:

Make a call and change your United flight

If you want to change your flight with the airline due to some reasons such as illness, poor weather, etc., you can dial the United Airlines flight change phone number 1-800-864-8331, and an executive of the airline will be assigned to offer you resolutions. And make sure to opt for the IVR appropriately so a live agent is assigned.

What is the United flight change policy?

There is a certain policy that one must follow concerning the flight change policy, and some of the points are the following:

Changes made within 24 hours carry 0% charges, and a refund without deduction is processed.
Nonrefundable ticket holders may not be eligible to make changes to their flights.
You can modify flight tickets within 48 hours before your flight.

Once you go through the discussion, you will find a way to call and its policy that will help you change your flight.