Visit the United Airlines website at www.united.com. Click on the tab at the top of the page marked Itineraries and Check In.
Choose the option titled My Itineraries.
Log in using your confirmation number, e-ticket number, or credit card number, and your last name. Click Continue. You will be taken to a page that lists your currently purchased United Airlines reservations. On this page you will be able to see a complete list of your flight details, including the date of your flight, time, destination and departure city. This option also allows you to upgrade or change your seats or exchange your tickets.
View your flight status under the Check in Online box. This can only be done within 24 hours of your flight. This also means you cannot view any flight changes, cancellations, or delays until at least 24 hours prior to your flight's departure. During the 24 hours prior to take-off, you can view your flight information to check for any changes by monitoring this section of the United Airlines website.