Seasonal Intern applicants have rated the interview process at United Airlines with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 74% positive. This is according to Glassdoor user ratings.
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There were two rounds of pretty standard behavioral phone interviews. For the in-person interview, there were two candidates and three managers interviewing. United paid for my flight to the interview location.