UAUnited Airlines (UA)
United States
Star AllianceEverything you need to know about flying with United Airlines. Check-in deadlines, boarding times, and expert tips to make your United Airlines flight smooth and stress-free.
Check-in & Boarding Timeline
Online Check-in
Opens24hbefore departure
Closes45mbefore departure
Airport Check-in
Opens3hbefore departure
Closes45mbefore departure
Boarding
Opens40mbefore departure
Closes15mbefore departure
Travel Tips
Recommendation
Arrive at the airport at least 2 hours before domestic flights and 3 hours before international flights to allow for check-in, security, and reaching the gate.
Self Service
Use online or mobile check-in as soon as it opens 24 hours prior to departure to secure your seat and receive updates.
Recommendation
Be gate-ready well before the final boarding deadline; United may close the aircraft door early to ensure on-time departure.
Frequently Asked Questions
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