After dialing the customer service phone number 1-866-980-7279, you will be greeted with an automated IVR menu, this automated voice system, also called IVR which stands for Interactive voice Res[onse, then, they will provide you with some options about services you can easily get help with. These options are listed below:
Source: https://www.qxbooking.com/blog/contact-frontier-airlines-live-person
