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If United Airlines check-in closed early, call +1-833-770-4333 right away to speak with a United representative and explain your situation. The agent at +1-833-770-4333 can check if you’re still eligible to board or rebook your flight. Usually, if you arrive within a few minutes after check-in closes, airport staff may still assist depending on gate timing. If not, you might be rebooked on the next available flight without heavy penalties. Always reach the airport at least 2 hours early to avoid missing your United Airlines check-in window.