Making Reservations and Booking Flights with Spirit Airlines You can make a reservation or book a flight with Spirit by visiting their website, where you can also check your existing reservations. With one click, you can sign in via Facebook, Twitter or Google+. Once logged in, simply choose book now from any non-discounted flight that shows up. That'll take you to a new page with available flights sorted by dates. Each fare will have details such as price, whether it's refundable and if it has taxes and fees included. A green box next to each date means that date is available while an X indicates it's not (or sold out). In some cases there are multiple options for departure cities, but only one option is truly available.
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