Why is flying Spirit cheaper than its competitors? Flying with Spirit Airlines is more like flying la carte. Their advertised bare fare price is just for the flight with very few extra amenities. Travelers can pay extra fees for non-essential products and services like seat selection, larger carry-on bags, checked bags, drinks, snacks, etc. which are usually included in a bundled price of traditional airlines. This business model helps Spirit to maintain a fare price as low as possible to win the business and gives travelers a chance to pay for what they truly want individually