When comparing Spirit Airlines vs Frontier Airlines, travelers often find themselves choosing between two of the biggest names in America’s ultra-low-cost airline market. Both carriers focus on affordable fares and customizable travel experiences, allowing passengers to pay only for the services they need. However, despite their similarities, there are several key differences that can make one a better option depending on your travel style and priorities.

1. Ticket Prices and Fees
Both Spirit Airlines and Frontier Airlines are known for their ultra-low base fares, often making them the most affordable options for domestic U.S. flights. However, the base fare typically includes just your seat — everything else, from carry-on baggage to seat selection, comes with an additional charge.

Spirit Airlines offers bundle deals through its Saver$ Club, which can reduce baggage and seat fees for frequent travelers.

Frontier Airlines provides its own bundles, The Works and The Perks, allowing passengers to combine popular add-ons like baggage and seat upgrades for less.

2. Comfort and Seating
When it comes to cabin comfort, Frontier Airlines generally has a slight edge. Frontier’s Airbus A320neo fleet offers seat pitch between 28–31 inches, while Spirit Airlines typically provides around 28 inches. Neither airline offers reclining seats or free in-flight entertainment, but both have options for upgraded seating with extra legroom for an added fee.

3. Route Network and Operations
Spirit Airlines has a wider network, serving over 80 destinations across the United States, Latin America, and the Caribbean. Frontier Airlines, while smaller, focuses on secondary airports and point-to-point routes, often resulting in lower fares and less congested airports. Depending on where you live, one airline may offer more convenient departure points than the other.

4. Onboard Services
Both airlines charge for snacks, beverages, and seat assignments. Wi-Fi and in-flight entertainment are not included, as both focus on keeping operational costs low. Passengers are encouraged to check in online and download the airline’s app for convenience.

Conclusion
In the Spirit vs Frontier Airlines comparison, both carriers deliver exceptional value for travelers seeking budget-friendly airfare. Spirit Airlines is ideal for those needing a wider route network and frequent flyer discounts, while Frontier Airlines appeals to travelers who prioritize slightly more comfort and less crowded airports. Ultimately, your choice depends on what matters most — price, convenience, or comfort.