For two days only, Spirit Airlines offers flights to over 25 U.S. and Caribbean destinations starting at just $28 each way, saving up to 75% off competitor fares. 

These fares are part of Spirit's "Crazy 8's Sale," which has fares as low as $8 each way on very select dates for travelers in their paid membership program.

Spirit's sale page will list the member and non-member fares and the select travel dates available at the lowest prices (through February). After clicking "Book Now" at the top of their page, use their new fare calendar that makes locating the best price very easy. 

Here are just a few outstanding each-way deals (based on roundtrip travel):

• Orlando - Fort Lauderdale ... $28
• Fort Lauderdale - Freeport, Bahamas ... $28
• West Palm Beach - Atlantic City ... $36
• Atlanta - Fort Lauderdale ... $36
• New York - Myrtle Beach ... $36
• Fort Lauderdale - San Juan, Puerto Rico ... $36
• Los Angeles - Fort Lauderdale ... $76
• Detroit - Las Vegas ... $76

The lowest fare may or may not be available on the departure and return leg of every flight, but the savings are still substantial. 

Click here for full details and to book directly with Spirit Airlines. Taxes and fees will be additional. Fares displayed in the fare calendar will not include any mandatory online booking fees and will appear $7 less than the rates displayed above. 

Remember to book by Dec. 17

Travelzoo Tip: Those who apply for the Free Spirit World MasterCard will get three free roundtrip flights after the first qualifying purchase -- along with complimentary membership to the $9 Fare Club.