If you travel Spirit from December 18th through January 5th, you can expect to pay an additional $2.00 per bag for checked baggage. That's each way. Above and beyond your carry-on baggage fee and the checked baggage fees.
This is what they had to say about the temporary increase:
"Winter is coming and that means holidays, which means more people than ever will be traveling with Spirit to visit their loved ones. To make sure we have room for everyone's bags, we're encouraging customers to pack a bit lighter."
The cheapest options you have are if you happen to be a $9.00 Fare Club member and you book and pay on-line, before online check-in, for tickets purchased after December 31st..
$26.00 for one carry-on bag
$21.00 for first checked bag
$31.00 for second checked bag
$76.00 for the third, fourth and fifth checked bag. Each.
You will pay the most if you check them at the gate. A whopping $100.00 per bag.
Here's the list of prices that vary depending on when you purchase your bags, be it on-line, or at the reservation center.
Bah Humbug.
Source: CS Monitor