What Is the Phone Number of Southwest Group Sales? Flyers can smoothly plan their group journey on Southwest. However, to do this, one can call at the number 1-800-433-5368 to reach the airline representatives and submit their request. However, the Southwest group travel reservation center is begin from 5 a.m. to midnight, Monday to Friday, to help their travelers who need it. By doing so, they can not only get answers to their queries but also learn other information about flight discounts, special offers, perks, and more. For further details about the group booking process, perks, and services, they can go through the official website of Southwest. #southwestgrouptravel