Is Frontier Airline Or Spirit Airline Better? » To help you choose the best airline, we examine ticket models, luggage costs, in-flight amenities, and customer service in this thorough comparison. Regardless of whether your top priority is cost savings, comfort, or simplicity of travel, we compare Frontier and Spirit to determine which low-cost carrier provides the greatest overall value. Discover how to maximize your dollars spent on travel and pick the airline that suits your requirements.