Best Budget Airlines in the USA in 2026: Which Carriers Are Actually Worth Booking?

Spirit is gone, Southwest charges for checked bags, and the fare on your screen is rarely the price you pay. Here’s which budget airline fits your trip in 2026, and how to find the real cost before you book.

The best budget airlines in the U.S. right now are not the ones with the lowest number on the search page. They’re the ones whose fare still works after you add the bag you’re bringing, the seat you need, and a backup plan if the flight cancels. No single carrier wins on all three for every traveler.

If you need a bag in the overhead bin, start with Southwest Airlines and JetBlue. Both include a carry-on and a personal item in their cheapest fares. Then price a rival’s fare with the same bag added, and book the lower total.

That comparison matters more than it did a year ago. Spirit Airlines began an immediate wind-down on May 2, 2026, canceling all flights. Eleven days later, Allegiant completed its acquisition of Sun Country Airlines. Southwest now charges for checked bags and assigns seats.

The remaining carriers face pressures of their own. “I expect Spirit’s liquidation to be a modest benefit to its low-cost competitors,” Joe Rohlena, senior director at Fitch Ratings, told Reuters in May, in an analysis that also described fuel and other cost pressures on budget airlines.

Below: seven carriers matched to the trips they suit, a five-step fare check, the fee traps to avoid, and what to do when a flight falls apart.

The Short List: Best Budget Airlines at a Glance

These labels match airlines to trips. They don’t certify the lowest fare on any route.

What Makes a Budget Airline Worth Booking

Six yardsticks separate a good deal from a cheap ticket. Use each one separately. One strong number doesn’t settle the booking.

1. Total trip cost, not base fare. An unbundled fare sells the flight alone and prices everything else separately. Each extra, such as a bag or a chosen seat, is an ancillary fee. Add them for every traveler, in both directions, plus what it costs to reach the airport.
2. What the cheapest ticket includes. A personal item fits under the seat in front of you. A carry-on goes in the overhead bin. JetBlue includes both on every current fare. Frontier includes only the personal item. Size limits differ by airline, so the same backpack can be free on one and billable on another.
3. Reliability. The Department of Transportation’s September 2026 Air Travel Consumer Report covers July flights. DOT counts a flight as on time if it arrives less than 15 minutes late.

Those tables don’t list Avelo, Breeze, or Sun Country. A missing row is not a zero. One month also doesn’t predict your flight, so weigh the seven-month column too.

4. Recovery options. Check how soon the airline could fly you again if your flight cancels. A route flown twice a week leaves you waiting far longer than one flown several times a day. An interline agreement is an arrangement between airlines that can support travel on both. For cancellations within the airline’s control, DOT’s airline cancellation and delay dashboard lists a commitment to rebook on a partner airline for JetBlue, but not for Southwest, Allegiant, or Frontier. Confirm it in the carrier’s current customer service plan before you rely on it.
5. Complaints and satisfaction. In the economy/basic economy segment of the J.D. Power 2026 North America Airline Satisfaction Study, Southwest scored 670 on a 1,000-point scale, Delta 667, and JetBlue 655. The study surveyed 10,914 passengers from March 2025 through March 2026, so it only partly captures Southwest’s assigned-seating era. On whether airlines can sustain satisfaction as costs rise, Michael Taylor, J.D. Power’s senior managing director of travel, hospitality, retail and customer service, said in the release: “The big question now is how long that can continue.”

DOT also logged July complaint cases: 773 for Frontier, 744 for JetBlue, 280 for Southwest, 111 for Allegiant, 78 for Breeze, 61 for Avelo, and 29 for Sun Country. Those are raw counts, not rates, and the airlines differ widely in size. Don’t rank the airlines by them.

6. Staying power. A ticket bought months ahead is only as good as the airline’s ability to fly it, as Spirit customers learned. The Reuters analysis in May reported Frontier’s response that it was positioned to replace capacity and become stronger; JetBlue did not respond to Reuters’ request for comment. Those are May observations, not forecasts. Your protection is practical: know your backup flights and pay with a credit card.

Jargon decoder

• ULCC (ultra-low-cost carrier): an airline that sells a bare fare and charges for nearly everything else.
• LCC (low-cost carrier): a low-fare airline that includes more in the base price.
• Basic economy: a restricted, lower-priced fare. The restrictions vary by airline.
• Bundle: a package of extras, such as bags, a seat, and flexibility, sold at one price.

The Best Budget Airlines of 2026, Matched to Your Trip

No fare data supports a strict first-to-seventh order, so each airline below is matched to the trip it serves best.

Southwest Airlines

Best for: Carry-on travelers who want a strong first quote.

What the cheapest fare gets you: Southwest’s lowest fare is now called Basic. It includes a carry-on and a personal item. Basic is nonrefundable, and changing flights requires upgrading to a Choice, Choice Preferred, or Choice Extra fare. Cancel at least 10 minutes before departure to keep any eligible credit, which expires six months from the original booking.

What changed: Checked-bag charges began for most tickets booked or changed on or after May 28, 2025, and assigned seating started for travel on January 27, 2026. Most fares let you pick a seat at booking; Basic ordinarily gets one at check-in. Bag fees vary by booking date and market, and an eligible fare, elite status, or card benefit can waive them. Southwest’s annual report presents the changes as initiatives to improve customer offerings and financial performance.

• Pros: Cabin bags included; a clearly published fare comparison.
• Cons: Paid checked bags; Basic is rigid.

Bottom line: We’d price Basic against the next fare up if your dates might move.

JetBlue

Best for: Onboard amenities with a carry-on included.

What the cheapest fare gets you: JetBlue announced a redesigned fare structure on July 27, 2026. Its core cabin now sells as Main Base, Main, and Main Flex. Main Base includes a carry-on (up to 22 x 14 x 9 inches) and a personal item (17 x 13 x 8 inches). It charges for advance seat selection and carries a change/cancellation fee, and a Base cancellation credit expires 12 months from original ticketing. Main Flex offers eligible cancellation refunds to the original payment method. Tickets booked July 29 or earlier keep their previous fare terms.

On board: JetBlue advertises free high-speed Fly-Fi Wi-Fi, onboard entertainment, and complimentary snacks and drinks in its core cabin.

• Pros: Carry-on on every fare; Wi-Fi, entertainment, and snacks advertised as included.
• Cons: The lowest July on-time rate (55.7%) and highest cancellation rate (9.8%) in DOT’s table.

Bottom line: We’d favor JetBlue for the amenities only after checking the schedule and the all-in fare. Use its bag calculator for any checked bag.

Breeze Airways

Best for: A nonstop that fits your dates.

What the cheapest fare gets you: Breeze sells four products: No Flex, Nice, Nicer, and Nicest. Its travel tips page includes a free personal item (17 x 13 x 8 inches) on every fare and ties carry-ons (22 x 14 x 9 inches, 35 pounds) to Nicer and Nicest. Checked bags run to 62 linear inches and 50 pounds. Confirm exactly what your chosen fare includes at checkout, and don’t assume a No Flex fare is as flexible as the others. Breeze’s fully refundable add-on, for example, requires canceling online at least one hour before departure and isn’t available on No Flex.

Where it flies: Breeze has added international routes. Tampa International Airport reports that service to San José, Costa Rica, began October 3, 2026, on Wednesdays and Saturdays.

• Pros: A nonstop can eliminate a connection.
• Cons: A twice-weekly route gives you few same-route alternatives.

Bottom line: We’d choose Breeze because the nonstop serves your dates, not because the route exists.

Sun Country Airlines

Best for: A Minneapolis–St. Paul itinerary.

What the cheapest fare gets you: Read the Sun Country booking screen and your confirmation for the bag and change terms on your specific trip. Don’t rely on older guides.

The merger, in practice: Allegiant’s integration FAQ says the two airlines continue to operate independently, with separate booking systems and loyalty programs that have not yet combined. Allways Rewards points can’t currently be redeemed for Sun Country flights. The combined company will eventually operate under the Allegiant brand; no final date is given. Allegiant says it will communicate changes in advance.

• Pros: A relevant option to price on any Minneapolis–St. Paul trip.
• Cons: Fare details and the integration timeline are still moving.

Bottom line: We’d deal with the airline named on your reservation for check-in, changes, and service.

Allegiant Air

Best for: A convenient leisure nonstop.

What the cheapest fare gets you: One free personal item, no larger than 8 x 14 x 18 inches, which must fit entirely under the seat. Per Allegiant’s baggage policy, a carry-on (up to 10 x 16 x 22 inches) and checked bags (up to 50 pounds and 80 linear inches) cost extra, and cost more at the airport. Bundles must be bought at the original booking and can’t be swapped later.

The fine print: Without Trip Flex, Allegiant’s fee page says no credit is issued for no-shows or cancellations within seven days of departure. That limit applies when you cancel. It doesn’t replace your federal refund right when the airline does.

Airport quirk: Allegiant sells tickets at airport counters only during limited hours, usually for one hour after a scheduled departure, and doesn’t accept cash, checks, or money orders there.

Scale: At closing, Allegiant said the combined company had 195 aircraft serving nearly 175 cities.

• Pros: True à la carte choice; the best July cancellation rate in DOT’s table (0.5%).
• Cons: Extras add up; a low cancellation rate doesn’t guarantee a quick rebooking.

Bottom line: We’d check the next usable departure before booking Allegiant for a fixed-date event.

Avelo Airlines

Best for: A smaller-airport nonstop near you.

What the cheapest fare gets you: One personal item, no larger than 17 x 13 x 9 inches. A carry-on (up to 22 x 14 x 9 inches) costs extra, and costs more if you don’t buy it with the initial reservation.

Know the clock: Online check-in opens 24 hours before departure, and Avelo instructs customers to check in at least 40 minutes out. Boarding starts 45 minutes before departure, and you must be on board 15 minutes before.

A changed network: In January 2026, Avelo announced a recapitalization, base closures, and the removal of six 737-700 aircraft, which it described as a step toward sustainable growth.

• Pros: Nonstop access from an airport that may be closer to home.
• Cons: A reshaped route map; seasonal service.

Bottom line: We’d confirm the flight on Avelo’s route map, which separates regular from seasonal service, and in search results for your exact date.

Frontier Airlines

Best for: Personal-item-only trips, or a well-priced bundle.

What the cheapest fare gets you: A personal item on every fare, per Frontier’s bag rules: 18 x 14 x 8 inches and up to 35 pounds, handles, wheels, and straps included. Size is checked at boarding. A carry-on (24 x 16 x 10 inches, 35 pounds) costs extra, and ordinary checked bags are limited to 40 pounds. Prices vary by travel date and by when you buy.

The bundles: Frontier’s Economy bundle adds a carry-on, standard seat selection, and no change or cancellation fee. Premium adds premium seating and earlier boarding. Business adds two checked bags of up to 50 pounds each and UpFront Plus seating.

On board: Frontier’s entertainment FAQ says its flights currently have no Wi-Fi, TV or movies, or electrical outlets. The airline, led by CEO Jimmy Dempsey, plans its first Starlink-equipped aircraft for early 2027.

• Pros: A workable fare if you truly travel light; flexibility built into the bundles.
• Cons: Strict sizing; bare cabin; 62.5% on time and 3.4% canceled in July.

Bottom line: We’d price the Economy bundle against the base fare plus every extra you need.

Where did Spirit go? Spirit stopped flying on May 2, 2026. Its wind-down site tells customers not to go to the airport and says its call center and email service are no longer available. If you still hold a Spirit ticket or credit, skip to the Plan B section below.

How to Find the Real Price of a Budget Fare in 5 Steps

Before you start: Have your dates, the number and ages of travelers, each packed bag’s dimensions and weight, your seating needs, how you’ll reach the airport, and the latest arrival that still works. Keep those assumptions identical for every quote.

1. Search wide, then book direct. Use a broad search tool such as Google Flights to build a shortlist, then confirm the flight and fare terms on the airline’s own site. No search tool is guaranteed to show every carrier or fare. Save the exact fare name and seller. One more reason to book direct: DOT’s 24-hour cancellation or hold requirement covers airline tickets bought at least seven days before departure, and it doesn’t automatically extend to online travel agencies.
2. Decide what you’re really bringing. Count your items. Measure each bag packed, on every side, and compare each dimension with the airline’s limit. Allegiant counts wheels, handles, pockets, and decorations.
3. Add bags and seats at booking. Frontier and Allegiant both state that bags cost more at the airport, and Avelo charges more for a carry-on added after the initial reservation. Price everything essential now.
4. Price the bundle against à la carte. Run the same itinerary twice and write down both checkout totals before paying:
   • À la carte total = fare + carry-on + checked bag + seat + ground transportation + any membership cost for this trip
   • Bundle total = fare + bundle upgrade + any extras the bundle leaves out + ground transportation + any membership cost
   • Count all passengers and both directions. A bundle wins only when it costs less than the extras it replaces. Two add-ons don’t automatically make it the better buy.
5. Run the same trip on a major airline. Price both basic economy and main cabin with the same bags and seats. Compare the checkout total, the airport, total travel time, and the next usable departure. If the major costs less for the same needs, book it.

Pro tip for families DOT’s family seating dashboard lists which airlines commit to seating a child 13 or under next to an accompanying adult at no extra fee. Frontier and JetBlue are listed as making that commitment; Allegiant is not. Guarantees depend on adjacent seats being available at booking, and they cover one adult beside the child, not the whole party. Put everyone on one reservation and read the airline’s own plan before paying for seats.

The Fee Traps That Catch First-Time Budget Flyers

Mistake: Putting off a bag you know you’ll need. Fix: Price it during booking and compare it with the bundle. Frontier, Allegiant, and Avelo all charge more for bags added later.

Mistake: Trusting your bag’s label. Fix: A bag sold as a “carry-on” isn’t a free personal item. Measure every outer dimension, wheels and handles included, against your airline’s limits.

Mistake: Treating departure time as the check-in deadline. Fix: Check in on the airline’s app or site, keep the boarding pass, and learn the separate deadlines for check-in, bag drop, and boarding. They differ by carrier. Avelo’s 40-minute check-in cutoff is one example, not a universal rule.

Mistake: Booking the wrong airport. Fix: A city search can return several airports. Check the airport code, its location, and the door-to-door cost before you pay.

Mistake: Booking a can’t-miss event on a thin schedule. Fix: Look at the route’s calendar before you buy. If the next flight is days away, fly a day early or choose a carrier with more departures. A refund won’t necessarily buy you a seat on another airline.

Mistake: Buying a flight pass without doing the math. Fix: Frontier’s GoWild pass ordinarily opens domestic booking the day before departure and international booking 10 days out. Seats are limited, blackout dates apply, and bags, seats, and taxes are extra. The terms provide for automatic renewal unless you cancel by the stated deadline. Count only the trips you’d realistically take.

Mistake: Assuming every seller plays by the same rules. Fix: Identify who is selling the ticket and taking your payment, and save their conditions. We’d book direct so changes and refunds go through the airline.

Warning: Flight credits expire, and the clock varies A Southwest Basic credit expires six months from the original booking. A JetBlue Base credit lasts 12 months from ticketing. Breeze describes a credit that expires 12 months after booking. None of those windows starts on the day you cancel. Write down the expiration date the day a credit arrives.

Your Plan B When a Budget Flight Is Canceled

Save the cancellation notice and your original itinerary first. Then work through these in order.

1. Know your refund right. Under federal rules (14 CFR Part 260), an airline that cancels or significantly changes your flight owes you a refund if you decline the alternatives it offers. A significant change includes a departure at least three hours earlier or an arrival at least three hours later on a domestic trip (six hours for international), a different origin or destination airport, added connections, or a downgrade. Refunds are due within seven business days for credit-card purchases and 20 calendar days for other payments. One narrow exception: DOT is not enforcing the rule, through July 7, 2027, for flights that are merely renumbered when passengers are rebooked without a significant change or delay. You get the refund or the replacement flight, not both.
2. Check the next departure before you accept a rebooking. Compare the offered arrival with your real deadline. Ask about alternate airports.
3. Price a seat on another airline. Weigh that fare against your expected refund and the cost of waiting. Don’t assume your original airline will reimburse a ticket you buy yourself.
4. Ask for what the airline has promised. For cancellations within the airline’s control, DOT’s cancellation and delay dashboard lists meal commitments from Southwest, JetBlue, Allegiant, and Frontier, and hotel and ground-transportation commitments from Southwest, JetBlue, and Allegiant, but not Frontier. Weather doesn’t trigger them. Read the carrier’s current plan and keep your receipts.
5. Lean on your credit card if the airline fails. After Spirit’s shutdown, DOT’s guidance directed cardholders to ask their issuers about chargebacks for services not rendered, to check travel insurance, and to consider filing a proof of claim in bankruptcy, which it warned may bring only partial recovery. Spirit’s announcement said direct card purchases would be refunded automatically, travel-agency customers should contact their agent, and vouchers, credits, and points would be addressed later in bankruptcy. If your money is still missing, call your card issuer or agent with your confirmation and cancellation records, and ask about dispute deadlines.

Tip: Read your travel insurance before you count on it Check whether the policy covers an airline’s insolvency or cessation of service, and ask the insurer whether your airline and booking qualify. A canceled flight, or even a failed airline, doesn’t by itself mean you’re covered.

When a Major Airline’s Basic Economy Is the Better Deal

Sometimes the budget airline isn’t the budget choice. A full-service carrier can win when:

• The same bags and seat cost less overall. Once you add a carry-on and a seat to a bare fare, a major’s basic economy can undercut it.
• The trip has a hard deadline. More usable departures shrink the cost of a cancellation.
• The airport works better. A long, expensive ride to a distant airport erases a fare gap.

Basic economy isn’t uniform either:

• American: Basic Economy includes one carry-on and one personal item. Choosing a seat generally costs extra, and changes are limited.
• Delta: Its published baggage policy includes a carry-on and a personal item on Delta-operated flights.
• United: Its domestic Basic Economy terms exclude a full-size carry-on. You can buy a seat assignment before check-in.

A big-airline name doesn’t guarantee a more reliable flight, a hotel room, or a free checked bag. Check the terms for your itinerary.

The rule: Compare equal trips, then book the lowest total you can live with if things go wrong.

FAQ

Q: What is the best budget airline in the U.S. right now for someone who just wants the cheapest total price with one carry-on bag?

A: The cheapest total price with one carry-on bag depends on your route and dates, and no single budget airline wins everywhere.

• Start with Southwest and JetBlue, whose lowest fares include a carry-on.
• Price Breeze, Frontier, Allegiant, and Avelo with the carry-on added.
• Use identical dates, and count the cost of reaching each airport.

Q: Is Spirit Airlines still flying in 2026, and what should I do if I still have a Spirit ticket or credit?

A: Spirit Airlines is no longer flying; it canceled all flights when it began winding down on May 2, 2026.

• Don’t go to the airport for a Spirit flight.
• If you paid by card and haven’t been refunded, contact your card issuer. If you booked through a travel agency, contact the agency.
• Don’t assume Spirit points, vouchers, or credits have cash value. They are being handled through the bankruptcy process.

Q: How do I work out, step by step, what a Frontier or Allegiant flight will really cost me after bags and seats?

A: A Frontier or Allegiant flight’s real cost is the fare plus every service you need, for every traveler, in both directions.

1. Enter all passengers and both flights.
2. Add the bags and seats you need.
3. Price the bundle, then add anything it leaves out.
4. Compare the two totals, plus airport transportation.

Q: Are budget airlines as safe as the major airlines in the United States?

A: Budget airlines in the United States get no exemption from FAA certification requirements because their fares are low.

• The FAA’s Part 121 certification process evaluates an airline’s compliance and its management of safety risks.
• Part 121 covers scheduled service by large U.S. airlines and regional carriers alike.
• A shared rulebook is not a carrier-by-carrier safety ranking, and none is offered here.

Q: What happens if my budget airline cancels my flight and the next one isn’t for three days?

A: A canceled budget airline flight leaves you a choice between the airline’s replacement flight and a refund.

• Check the offered flight against your deadline before accepting.
• Look for seats on another airline.
• Ask what the carrier has committed to for meals and hotels.
• A refund returns what you paid. It doesn’t cover a pricier replacement ticket.

Q: Is Southwest still considered a budget airline now that it charges for checked bags and assigns seats?

A: Southwest still belongs in a budget airline comparison whenever its complete fare works for your trip.

• Its lowest fare, Basic, still includes a carry-on and a personal item.
• Checked bags cost extra, and Basic requires an upgrade to change flights.
• Assigned seating changes how you buy, not the arithmetic.