Which airline has the worst customer service? Here are some of the major findings: The worst airlines for customer service are United Airlines (665) and Frontier Airlines (659). The most improved carriers are American Airlines and Delta Airlines, adding 16 points each. WestJet fell by the most, plummeting 19 points from 2014.What is southwest airlines customer service phone number? The customer support phone number of Southwest Airlines is 1-800-435-9792, 1-800-435-9792, 1- 214-932-0333 (Click phone number to call). The postal and official address, email address and phone number (helpline) of Southwest Airlines Service Center and Southwest Airlines customer service phone number is given below.
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