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Southwest Airlines Reservations Phone Number: 1-800-I-FLY-SWA (1-800-435-9792) Above mentioned number is Southwest Airlines customer service, Reservation, Information toll free number for passengers, Using this number you can able to Reserve your ticket from your home itself. Read also: Delta Airlines Customer Care.
BananaStock/BananaStock/Getty Images. Passengers wishing to cancel flights before the departure date and time can do so online on Southwest's website or by calling reservations at 1-800-435-9792. If the flight has already departed, passengers can still cancel by calling the reservation department's 800 number.