To book a United Airlines flight by phone, simply call 
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+1(855)-927-1543, where a customer service representative will guide you through the booking process. You can provide your travel details, such as dates, destinations, and passenger information, and the agent will help you find the best flight options. Booking by phone allows you to get personalized assistance and ensure that all your preferences are met. For any inquiries or help with booking, don’t hesitate to contact United Airlines at +1(855)-927-1543 for a smooth and efficient reservation experience.