Get in touch with United’s customer service. 

Additionally, you can choose a seat by speaking with a live agent of the airline. The agents can be contacted in a variety of ways. Calling the United Airlines customer support number and holding off until someone answers is the best and most effective method. They will provide you with precise directions on how to select the seats of your choice at the most affordable cost.

You can also learn the complete United Airlines Missed Flight Policy after calling one of United’s live representatives.