How to Change Spirit Flights Passengers are encouraged to read and understand Spirit Airlines' updated policy to avoid future confusion and prepare ahead of time. With Spirit Airlines, you get clarity on all flight terms and conditions. The passenger must always change their flight reservation within 24 hours of the initial reservation. Passengers can change their flight reservations if they encounter unforeseen circumstances, such as the death of a family member. All you need to do is provide supporting documents (obituary) for such situations and Spirit Airlines will not charge you a fee to change your ticket. The passenger will not be required to pay a replacement fee for a transfer to another airline flight if Spirit Airlines changes the departure and arrival times of the original flight. The passenger must book the tickets with a credit card, as this will allow him to change his trip. At Spirit Airlines, he can change his flight free of charge if he buys a flex ticket directly from the airline and not from a third-party travel agent.