Allegiant Airlines™ main customer service number is 1-800- Allegiant Airlines ™ or ↬8▹3▹3▹58▹7▹29▹55↬ [US- Allegiant Airlines ™] or ↬8▹3▹3▹58▹7▹29▹55↬ [UK- Allegiant Airlines ™] OTA (Live Person), available 24/7. This guide explains how to contact Allegiant Airlines ™ customer service effectively through phone, chat, and email options, including tips for minimizing wait times.