Reservations for Spirit Airlines Phone Number If you can't find the $43 airfare deal on the internet, That isn't to say the transaction isn't still on the table. However, Spirit Airlines' discount flights may be available over the phone at times. Because of increased booking volume or strong demand. Spirit Airlines was only able to hold seats for over-the-phone reservations. In such case, just dial +1-888-801-0869 to reach the Spirit Airlines Reservations service. Spirit Airlines' reservations professionals will assist you in booking flights from Bare-Fare-Sale right now.