Visit the website for United Airlines (see Resources) 24 hours prior to your flight. On the main page of the website, select the "Check-in" tab. Whether you have booked your trip online or over the phone, you will be provided with a confirmation or E-Ticket number.
Enter your confirmation or E-Ticket number into the appropriate field. Entering your last name will also ensure a quick response time from the United Airlines website.
Review and print your itinerary. There will be a "print" button on the United Airlines page, but you can also print from the dropdown menu on your internet browser.
Ensure your printed E-Ticket shows all the appropriate information including your name, flight number and bar code. Without the bar code, your ticket will be invalid.