Ultra Low Cost Flights

These are every active U.S. ultra-low-cost and low-cost carrier as of mid-2026, what they’re actually known for, and the catch that most travelers discover after booking.

The questions every budget traveler asks — but most sites either over-complicate or duck entirely.

• 1
  What are the ultra-low-cost airlines in the U.S. right now? Frontier (cheapest, ~$19+ fares) · Allegiant (vacation routes from small cities) · Breeze (direct routes between mid-size cities) · Avelo (niche regional routes) · Spirit closed May 2, 2026

  There are four active ultra-low-cost carriers (ULCCs) operating U.S. domestic routes: Frontier, Allegiant, Breeze, and Avelo. Frontier leads on sheer price — its cost per seat mile of approximately $0.095 is the lowest of any U.S. carrier, and it regularly advertises fares under $30 on competitive routes. Allegiant’s genius is geography: it flies directly from smaller regional airports (Fargo, Provo, Shreveport) to vacation hotspots like Las Vegas and Orlando, often avoiding the larger hubs that drive up cost. Breeze, founded by JetBlue’s original creator, targets underserved city-pair routes — think Hartford to Los Angeles direct — using modern Airbus A220 aircraft. Avelo operates near convenience airports like Burbank and New Haven to avoid expensive hub fees. The landscape changed seismically in early May 2026 when Spirit Airlines — which for three decades was the price floor for the entire industry — shut down permanently. Frontier has stepped into Spirit’s old routes and is now the dominant ULCC. The Allegiant-Sun Country merger also took effect in May 2026, creating a combined leisure-focused carrier with wider reach.
• 2
  Where can I find ultra-cheap flights right now? Google Flights (best overall, shows all-in pricing) · Frontier.com directly for lowest fares · Hopper (price prediction) · Going.com (deal alerts) · Skiplagged (hidden-city fares) · Never rely on a single site — always check 2–3

  Google Flights is the starting point for most serious deal-hunters because it pulls prices from nearly every airline and shows you a calendar view of the cheapest days in a given month — not just the dates you searched. From Frommers’ independent ranking of airfare search sites, Google Flights and Skiplagged consistently rank among the best tools for finding genuinely low fares. For the ULCCs specifically, always check the airline’s own website too — Frontier.com sometimes has direct fares that don’t appear fully in aggregators. Hopper’s price prediction feature tells you whether current fares are expected to rise or fall, which can save real money if the algorithm is right. Going.com (formerly Scott’s Cheap Flights) is worth a free subscription for email alerts about genuinely low fares — their team manually validates deals and members report saving 40–50% on average. One practical rule: never book a ULCC flight by looking at the headline fare only. Always add carry-on bag cost (or confirm you’re packing only a personal item), add seat selection if you care where you sit, and compare the total to what a mainstream carrier charges. Google Flights’ “bags” filter lets you build this comparison in seconds.
• 3
  What is the cheapest place to fly in the U.S. right now? Leisure hubs — Las Vegas, Orlando, Fort Lauderdale — tend to have the most competition and lowest fares · Secondary/regional airports served by Allegiant and Frontier often have surprisingly low prices · Flexible destination search on Google Flights shows you the cheapest destination from your city on any date

  The most genuinely cheap domestic routes are always on high-competition corridors where multiple airlines compete for the same passengers — Las Vegas, Orlando, Cancun gateways, and major Florida cities typically have the most flights and therefore the most fare competition. The hidden opportunity is Allegiant’s secondary airport network. If you live within reasonable driving distance of a smaller regional airport like Bellingham (near Seattle), Punta Gorda (near Fort Myers), or Presque Isle (Maine), Allegiant often flies direct to vacation destinations that require a connection on major carriers. The full-trip fare from a secondary airport — even accounting for driving farther — frequently beats the price from the nearest major hub. The most powerful tool for finding the cheapest destination from wherever you are: open Google Flights, enter your departure city, leave the destination blank, and switch to the “Explore” map. The map shows you live prices to hundreds of destinations on any date you choose. This turns the question from “how do I get to X cheaply” to “what’s the cheapest place I can go right now.” Many experienced budget travelers plan trips this way — destination flexible, dates flexible, budget fixed.
• 4
  What is the best day to fly to get the cheapest fare? Cheapest day to FLY: Tuesday (14% cheaper than Sunday, per Expedia 2026 Air Hacks) · Cheapest day to BOOK: Friday · Midweek departures (Tue/Wed) average $56–$100 less per ticket than weekend departures · Sunday is the most expensive day to fly domestically

  Expedia’s 2026 Air Hacks Report — built from analysis of millions of bookings — found that Tuesday is the cheapest day to depart on domestic U.S. flights, averaging about 14% less than Sunday departures. That translates to roughly $56 less per ticket on an average route, and can exceed $100 savings during peak travel periods like spring break, summer, and holidays. The cheapest day to actually make your booking, separately, is Friday — 3% cheaper than Sunday booking. The underlying reason is consistent: business travelers fill planes on Sunday evenings (returning to Monday workplaces), Friday afternoons, and Monday mornings, pushing prices up on those days. Tuesday through Thursday seats remain less contested and more competitively priced to fill. Importantly, this pattern breaks down entirely during major holidays. Thanksgiving, Christmas, July 4th, and spring break weeks see demand overwhelming any day-of-week discount — the cheapest departure day becomes whatever day everyone isn’t fighting over. For those holiday windows, book earlier, not smarter on timing.
• 5
  How far in advance should I book a cheap domestic flight? Optimal booking window: 30–45 days before departure for domestic flights · Cheapest average fare: around 30 days out ($228 average per Kayak 2026 data) · Booking too early (6+ months out) often costs more than 30–45 days · Last minute (1 week out): usually expensive except for specific flash sales

  The old conventional wisdom — “book as early as possible” — turns out to be wrong for domestic U.S. travel. Kayak’s 2026 data on optimal booking windows shows the lowest average domestic fares at approximately 30 days before departure, at around $228. Booking six months out typically costs more because airlines price peak inventory higher early, waiting for business travelers willing to pay top dollar. The fare curve dips in the 3–7 week window before departure when airlines discount remaining seats. For peak travel periods — Thanksgiving week, Christmas, the July 4th window, and spring break — add one to three months to this window. For those dates, the demand is so concentrated that waiting for the 30-day sweet spot may leave you with few options at any price. The nuanced point: Hopper’s price prediction feature uses machine learning to tell you whether current fares on your specific route are expected to rise or fall. If Hopper says “prices are expected to rise — book now,” that’s worth taking seriously, even if it’s 60 days out. If it says “wait,” give it a week and check again.
• 6
  Is the Amazon $25 flight real? No — Amazon does not sell flights · The “$25 Amazon flight” is a viral rumor with no basis in reality · Amazon has never operated a consumer airline or passenger flight booking service · Anyone claiming to sell “$25 Amazon flights” is likely a scam or clickbait

  This question surged in Google’s “People Also Ask” section because someone shared a social media post claiming Amazon was selling $25 domestic flights as a Prime benefit. It is not true. Amazon sells products, operates Amazon Air for cargo, and has no passenger airline service or flight booking product. There is no $25 Amazon flight. Amazon Prime membership does not include any airline ticket discount or flight benefit. If you see a website, ad, social media post, or email claiming you can book a “$25 Amazon flight,” it is either a scam, a clickbait headline designed to get your click, or a gross misreading of something unrelated. The actual cheapest domestic flights in the U.S. are sold directly by Frontier Airlines and Allegiant Airlines on their own websites, and Frontier does legitimately advertise fares under $30 on specific routes during promotional periods — those are real. The Amazon version is not.
• 7
  What is hidden-city ticketing and is it legal? Hidden-city (skiplagging): booking a flight with a layover in your destination and not boarding the final leg · Legal for passengers to do · Violates airline Terms of Service — airlines can cancel your return ticket or frequent flyer account · Only works one-way and with carry-on only — never check a bag with this strategy

  Hidden-city ticketing is the practice of booking a flight where your actual destination is a layover, not the final stop. Example: flights from Atlanta to Chicago are expensive, but a fare from Atlanta to Minneapolis with a layover in Chicago is cheaper — so you book the through-ticket and simply don’t board the connecting flight. The fare difference can be significant on certain routes. Skiplagged.com is a search engine specifically built to find these opportunities. It’s not illegal — passengers can choose not to board any segment — but it violates every major airline’s Terms of Service. The consequences if you get caught: airlines have cancelled return tickets, stripped frequent flyer miles, and in rare cases banned passengers. It only works reliably with one-way tickets and carry-on luggage only — checking a bag on a hidden-city fare means your luggage travels to the final destination while you don’t. Never check a bag when using this strategy. Skiplagged searches for these opportunities automatically and marks them clearly, so you always know when you’re looking at a hidden-city fare versus a standard one. For most occasional travelers, standard deal-hunting through Google Flights and airline websites gets you to near-equivalent savings with none of the risk.
• 8
  How do I avoid ultra-low-cost airline fees and pay only the advertised price? Pack only a personal item that fits under the seat (16″×12″×6″ or similar) — this is genuinely free on every ULCC · Book directly on the airline’s website, not through a third party · Never print at the airport (kiosk fee $2–$10) · Skip seat selection unless you have specific needs · Set fare alerts on Google Flights and Hopper

  The passengers who actually pay the ultra-low advertised fares on Frontier and Allegiant are those who commit to one specific discipline: one personal item that fits under the seat in front, no checked bag, no carry-on bag in the overhead bin. Every other fee is avoidable. A 40L backpack that fits under the seat is technically a personal item and flies free on every ULCC. Pack everything into it — rolling clothes instead of folding, using packing cubes, and wearing your bulkiest items on the plane — and the advertised fare is what you actually pay. The second-biggest cost trap is seat selection. Most ULCCs allow you to skip seat selection and be assigned a random seat at check-in at no charge. You may not love where you land, but it’s free. If you’re traveling with a companion and want to sit together, selecting seats costs money — factor that in or call after booking to ask whether the check-in system will seat you together (it often does for pairs). Printing a boarding pass at the airport kiosk costs $2–$10 on most ULCCs — download the airline’s app and use a mobile boarding pass. It’s free and faster.

Use the buttons below to find nearby airports, Frontier and Allegiant service, or travel agencies that specialize in budget flights.