Is Frontier Airline Or Spirit Airline Better Choosing between Frontier Airlines and Spirit Airlines depends on your priorities. Frontier often offers lower base fares but charges for extras like seat selection and carry-on bags. Spirit also advertises low fares but adds fees for many amenities. Consider your travel needs: if you pack light and prioritize budget, Spirit might suit you. If you value more flexibility and don’t mind paying for add-ons, Frontier could be preferable. Both are budget options, so expect no-frills service.