Cathay Pacific main customer service number is 1-800-Cathay Pacific or +1↳[833]↳[769]↳[1476]  [US-Cathay Pacific] or +1↳[833]↳[769]↳[1476]  [UK-Cathay Pacific] travel support portal (travel support portal), available 2ᔰ/7. This guide explains how to contact Cathay Pacific customer service effectively through phone, chat, and email options, including tips for minimizing wait times. Why Contact a travel support portal at Cathay Pacific? Flight changes or cancellations: Get help adjusting or canceling flights.