What Frontier Airlines is and how it operates

Frontier Airlines is a low-cost carrier based in Denver, Colorado, that operates scheduled flights across the United States, Latin America, and the Caribbean. The airline is owned by Frontier Group Holdings and carries roughly 25 million passengers per year across a network of about 100 destinations.

Frontier's business model centers on keeping base fares low by charging separately for most services that other airlines include in the ticket price. This means your fare covers a seat and basic transportation — baggage, seat selection, checked bags, and carry-on bags beyond a personal item all cost extra. The airline operates a fleet of Airbus A320 and A321 aircraft, which are fuel-efficient narrow-body jets designed for short to medium-distance routes.

The airline sells tickets directly through its website (flyfrontier.com), through phone reservations, and through third-party booking sites like Kayak, Google Flights, and Expedia. Frontier also operates a frequent-flyer program called Frontier Miles, which allows passengers to earn points on flights and redeem them for future travel or other rewards.

Key Takeaways

  • Frontier's base fares are typically lower than legacy carriers, but most add-ons — baggage, seat selection, and boarding priority — carry separate fees that can add significantly to your total cost.
  • The airline operates primarily from Denver and serves destinations across the continental United States, plus routes to Mexico, Central America, and the Caribbean.
  • Frontier allows one personal item (purse, backpack, laptop bag) at no charge, but charges for carry-on bags and checked bags unless you purchase a higher fare class.
  • The airline does not assign seats automatically; you can choose your seat at booking for a fee, or board without a reserved seat and find an open one during boarding.
  • Frontier Miles members earn points on flights and can redeem them for tickets, seat upgrades, baggage fees, and other travel-related purchases.

Frontier's route network and hub structure

Frontier operates a hub-and-spoke network centered in Denver, where the majority of its flights originate or connect. The airline also maintains focus cities in Las Vegas, Orlando, and Philadelphia, where it operates a higher volume of flights but does not maintain the same level of connectivity as Denver.

The airline serves over 100 destinations, with the heaviest concentration in the western and central United States. Frontier also operates seasonal and year-round service to popular leisure destinations in Mexico (Cancún, Puerto Vallarta, Los Cabos), Central America (Costa Rica, Belize), and the Caribbean (Dominican Republic, Jamaica, Puerto Rico). The specific routes and frequency change by season, with more flights to warm-weather destinations during winter months.

Unlike major carriers such as American, Delta, or United, Frontier does not operate long-haul international routes to Europe or Asia. The airline focuses on point-to-point flights and connections within North America and the Caribbean region. If you need to reach a destination Frontier does not serve, you would need to book a separate ticket on another airline or use a connecting flight through one of Frontier's hub cities.

How Frontier's fare structure and add-on fees work

Frontier publishes its base fare — the cost of the seat and transportation — separately from optional services. When you search for a flight on flyfrontier.com or a third-party site, the price shown is the base fare. Additional charges appear during checkout or can be added before you complete your purchase.

The airline offers multiple fare classes. The lowest tier typically includes one personal item (a purse, small backpack, or laptop bag that fits under the seat). A mid-tier fare adds a carry-on bag (a rolling suitcase or larger backpack that fits in the overhead bin). A higher tier adds a checked bag. The exact names and contents of these fare classes change periodically, so review the fare details at the time of booking to understand what is included.

Beyond baggage, Frontier charges for seat selection (typically $5 to $15 depending on seat location and how far in advance you book), priority boarding (which lets you board earlier and claim overhead bin space), and other services. If you do not pay for seat selection, you can still board the flight and choose an available seat during the boarding process, though overhead bin space may be limited. Frontier also charges for changes to your flight (usually $75 to $99 plus any fare difference) and for printing a boarding pass at the airport ($5).

Baggage policies and what you can bring

Frontier allows one personal item at no charge on all fares. A personal item is defined as a purse, backpack, laptop bag, or similar small bag that fits under the seat in front of you. This item does not count toward your baggage allowance.

Carry-on bags (rolling suitcases, larger backpacks, or other bags that fit in the overhead bin) are included in mid-tier and higher fares but cost extra if you purchase the lowest base fare. The airline charges for the first checked bag on most fares; the cost varies by route and how far in advance you book, typically ranging from $30 to $40 for domestic flights. Additional checked bags cost more. Frontier does not charge for checked bags if you purchase certain higher fare classes or if you are a Frontier Miles elite member at certain status levels.

Baggage size limits follow standard airline rules: carry-on bags must fit in the overhead bin (typically 22 inches long, 14 inches wide, 9 inches deep), and checked bags must not exceed 62 inches in total dimensions (length plus width plus depth) or weigh more than 50 pounds. Oversized or overweight bags incur additional fees. Frontier also allows sports equipment (skis, golf clubs, bicycles) as checked baggage for an additional fee, usually $50 to $75 per item.

Booking, changes, and cancellations

You can book a Frontier flight through the airline's website (flyfrontier.com), by phone at 1-800-432-1359, or through third-party booking sites. Booking directly with Frontier sometimes offers lower fares or allows you to see all available add-ons before completing your purchase. Third-party sites may show lower advertised prices but do not always display all fees upfront.

Once you have booked, you can manage your reservation through the Frontier website using your confirmation number and last name. From there, you can add baggage, purchase seat selections, add Frontier Miles, or make other changes to your booking. You can also check in online 24 hours before departure through the website or the Frontier mobile app.

Frontier allows you to change your flight or cancel your booking, but the terms depend on the fare class you purchased and when you make the change. Most base fares are non-refundable, meaning if you cancel, you receive a credit toward a future Frontier flight rather than a refund to your original payment method. Changes to your flight typically cost $75 to $99 plus any difference in fare price. Some higher fare classes allow changes and cancellations with fewer restrictions or fees. Review the specific terms of your fare class at the time of booking.

Frontier Miles frequent-flyer program

Frontier Miles is the airline's frequent-flyer program. Members earn one mile per dollar spent on Frontier flights, plus bonus miles on certain routes or during promotional periods. You can enroll in Frontier Miles at no cost through the airline's website.

Miles can be redeemed for Frontier flights, seat upgrades, baggage fees, and other travel-related purchases. The number of miles required for a flight varies by route, season, and demand — a short domestic flight might cost 5,000 to 10,000 miles, while a longer route could cost 15,000 to 30,000 miles or more. Frontier also partners with other companies (hotels, car rental agencies, credit card issuers) that allow you to earn and spend miles outside of flying.

Frontier Miles members at higher status levels (achieved by flying a certain number of segments or earning a certain amount of miles in a calendar year) receive benefits such as free checked bags, priority boarding, and bonus miles on flights. The specific benefits and thresholds change annually, so check the Frontier website for current details.

What to expect when flying Frontier

Frontier operates a no-frills service model. Flights do not include complimentary snacks or beverages; you can purchase drinks, snacks, and light meals from the airline's in-flight menu. The airline does not provide pillows, blankets, or entertainment systems on most aircraft, though you can bring your own or purchase items from Frontier.

Boarding is typically divided into groups based on fare class and whether you paid for priority boarding. If you did not pay for seat selection, you will be assigned a boarding group and can choose an available seat when you board. Overhead bin space fills quickly on full flights, so if you are boarding later, you may need to check your carry-on bag at the gate.

Frontier's on-time performance and customer service ratings vary. The airline publishes on-time arrival data through the U.S. Department of Transportation, and you can review recent performance on the DOT website or through aviation tracking sites. If your flight is delayed or cancelled, Frontier's policies on rebooking and compensation follow federal regulations; the airline will rebook you on the next available flight at no charge, but does not provide meals or hotel accommodations for delays under certain thresholds.

Frequently Asked Questions

Can I bring a carry-on bag without paying extra?

It depends on your fare class. Frontier includes one personal item (purse, backpack, laptop bag) on all fares. Carry-on bags (rolling suitcases) are included in mid-tier and higher fares but cost extra on the lowest base fare. Check your fare details at booking to see what is included.

What happens if I miss my Frontier flight?

Frontier does not allow you to board if you arrive after the gate closes, which is typically 15 minutes before departure for domestic flights. You can contact Frontier to rebook on a later flight, but you will likely pay a change fee ($75 to $99) plus any fare difference. Some higher fare classes allow free changes.

Does Frontier fly international routes?

Frontier operates flights to Mexico, Central America, and the Caribbean, but does not fly to Europe, Asia, or other long-haul international destinations. If you need to reach a destination Frontier does not serve, you would book a separate ticket on another airline or connect through one of Frontier's hub cities.

How do I contact Frontier customer service?

You can reach Frontier by phone at 1-800-432-1359, through the website at flyfrontier.com, or through the Frontier mobile app. Wait times vary, especially during peak travel periods. The airline also maintains social media accounts on Twitter and Facebook.

What is Frontier's policy if my flight is delayed or cancelled?

Frontier will rebook you on the next available flight at no charge if your flight is cancelled or significantly delayed. The airline does not provide meals or hotel accommodations for most delays. If you are may have access to to compensation under federal law (for example, a cancellation within a certain timeframe), you can file a claim with Frontier or through the DOT.