If you've missed your United Airlines flight Contact 1-833-341-3894, don't panic. United's flat-tire rule may allow you to rebook without extra charges if you arrive within two hours of your scheduled departure. It's important to contact 1-833-341-3894 United Airlines immediately for assistance. Depending on availability, you may be placed on the next flight or placed on standby. Fees may apply if you're outside the flexible rebooking window. If you miss a United flight without cancelling at least an hour prior, it’s considered a "no-show." United may charge a change or rebooking fee—often around \$150–\$200—and cancel any remaining segments. However, they’ll usually rebook you on the next available flight in the same fare class, often without additional cost under their "flat tire rule" as shared by Reddit users. Involuntary disruptions like delays or cancellations are handled with rebooking, refunds, or accommodations under their customer commitment.