How do I check in online for a United Airlines flight and choose my seat?

I’m flying with United Airlines soon and would like to understand the process for online check-in. Can someone please guide me on how early I can check in online, what steps are involved, and how I can select or change my seat during the process? Also, are there any tips or things I should be aware of when checking in through the United Airlines website or mobile app? Any help or personal experiences would be greatly appreciated. Thank you in advance!

Hi @hazelsmith92920

You haven’t specified whether you’re checking in for an international flight to the USA, or a domestic flight within the USA.

I have some recent experience checking in for domestic flights within America and there’s nothing to it: in the app click on “Trips”, enter the booking number, and go from there. It was easy and seamless and I had no problem checking in and selecting my seats.

Online check-in for international flights is obviously going to be more complex (if you can do it at all) as presumably at some point a human will need to see your Visa and/or ESTA and Passport.