We’ve rounded up some of the craziest fees on Spirit’s long list of charges. 1. $35-$100 for a Carry-On Bag. If you didn’t get the memo that you have to pay for a carry-on at Spirit, you will be paying $50 at the kiosk. If you had warning, the fee for a carry-on bag is $35 before check-in. If you somehow make it past the kiosk and all the way to the gate with your carry-on, it will cost you a whopping $100 to bring it on the plane. Ouch.