United Airlines - Flight Check In

Check-in

Check in with one of the following options:

Sign in to MileagePlus

We can gather all your travel infromation and help you check in faster.

Confirmation or eTicket number

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You're able to check in starting 24 hours before your scheduled departure.
Minimum time requirements for check-in, checking bags and boarding vary based on your departure airport and destination. Learn more about these requirements.