The process of check in United Flight is rather simple. Passengers can ensure their travel is as stress-free and pleasurable as possible by taking the time to plan in advance. Whether you check in in person or online, the procedure is made to be quick and easy. The procedure will vary significantly for foreign or group flights. Further paperwork will be required from passengers, such as passports and visa information. A traveller may also need to confirm their ticket information with other passengers on group flights.