If you need to speak to a live person at United Airlines, there are a few ways to do so. The best way to reach customer service is to call the airline directly. The number for United Airlines customer service is 1-800-864-8331.

If you are calling from outside of the United States, the number to dial is 1-800-864-8331. When you are prompted, enter your 10-digit MileagePlus number. You will then be connected to a customer service representative.

Another way to reach customer service is to use the airline's live chat feature on their website. To access the live chat, you will need to be logged in to your account. Once you are logged in, click on the "Contact Us" link at the bottom of the page. Then, click on the "Chat with Us" option. A customer service representative will then be able to assist you.