Checking in for a United Airlines flight is a simple process that gives you multiple convenient options. You can check in online, through the mobile app, at a self-service kiosk, or at the airport counter. The most efficient way is to check in online at united.com or via the United mobile app. Online check-in opens 24 hours before your scheduled departure and remains open until the check-in deadline—45 minutes before domestic flights and 60 minutes before international flights. To start, go to the United Airlines website or app and enter your confirmation number along with your last name. Once your reservation is retrieved, you can select or change your seat, add any checked baggage, update frequent flyer information, and even purchase upgrades. After check-in, you’ll receive your boarding pass, which you can print, email, or save to your phone for easy access at the airport. Using the United mobile app is especially helpful, as it keeps your boarding pass, flight status, and gate updates in one place. If you prefer checking in at the airport, United provides self-service kiosks at most major airports. These kiosks allow you to print your boarding pass, check bags, and make last-minute changes. Simply scan your ID or enter your confirmation number, follow the on-screen instructions, and print your documents. If you have questions or need assistance, United staff are available at the counters. Passengers traveling with special needs, unaccompanied minors, or those who prefer personal service should check in directly at the counter. United recommends arriving at the airport at least two hours before domestic departures and three hours before international flights to allow enough time for check-in, baggage drop, and security screening. Additionally, be aware of the final check-in and baggage cut-off times: 45 minutes before domestic flights and 60 minutes before international ones. Failing to check in on time could result in denied boarding. For travelers who want to skip the lines entirely, United also offers curbside check-in at select airports. This allows passengers with minimal luggage to check in quickly and head straight to security. Frequent flyers and Premier members often enjoy priority check-in lanes and expedited service. In summary, you can check in for a United flight in several ways—online, via the mobile app, at a kiosk, or in person at the airport. Online or mobile check-in is the fastest and most convenient, especially if you’re traveling with carry-on only. Whichever method you choose, make sure to complete check-in before the deadline and allow enough time to navigate the airport. Checking in early helps secure your seat, avoids unnecessary delays, and ensures a smooth start to your journey with United Airlines.