Residents of Gilbert, Arizona enjoy a strategic location that puts two major airports within easy reach—Phoenix Sky Harbor International Airport (PHX) and Phoenix‑Mesa Gateway Airport (AZA). That dual‑airport advantage has attracted a cluster of budget airlines determined to make flying more affordable for families, solo travelers, and business commuters alike. Whether you’re chasing a weekend getaway or planning a cross‑country trip, understanding which low‑cost carriers serve this corner of the Valley of the Sun can slash your travel expenses without forcing you to sacrifice reliability or comfort.

In the sections that follow we’ll profile the budget airlines that operate from the Gilbert area, share strategies for unearthing the lowest fares, and explain how to navigate both airports in a way that keeps your wallet happy. We’ll also break down the fees that catch many first‑time fliers off guard and answer the most common questions Gilbert travelers ask before they book.

Which Budget Airlines Serve Gilbert, Arizona?

Technically, no commercial airline has its hub inside Gilbert town limits, but the two airports nearest to the town make virtually every domestic budget carrier accessible. Phoenix Sky Harbor sits about 20 miles west of downtown Gilbert, while Phoenix‑Mesa Gateway Airport lies roughly 12 miles southeast. Depending on traffic, you can reach either in 20‑35 minutes by car. The presence of two competing airports gives Gilbert residents a pricing advantage that many other mid‑sized suburbs don’t have—airlines serving one airport often match or undercut fares offered at the other.

At Sky Harbor you’ll find well‑known low‑cost carriers such as Southwest Airlines, Spirit Airlines, and Frontier Airlines. Meanwhile, Mesa Gateway leans heavily on leisure‑focused, ultra‑low‑cost models; Allegiant Air dominates there, and Sun Country Airlines appears during peak travel seasons. On rare occasions you may spot flash sales from additional carriers like Avelo or Breeze, but the four mainstays handle the overwhelming majority of budget traffic for Gilbert fliers.

Each of these airlines has a dramatically different philosophy about what “budget” means, and knowing the trade‑offs ahead of time can save you both money and frustration.

Southwest Airlines: The Low‑Cost Carrier That Doesn’t Feel Like One

If you ask Gilbert frequent fliers to name their favorite budget airline, Southwest tops the list more often than any other. Southwest Airlines does not position itself as an ultra‑low‑cost carrier, but it consistently delivers some of the lowest base fares out of Phoenix Sky Harbor—especially when you book a few weeks in advance. The airline’s most celebrated feature is its two free checked bags policy; no other major U.S. carrier matches it. For families hauling car seats, golf clubs, or extra luggage, that alone can shave $60‑$120 off a round‑trip ticket compared with Spirit or Frontier.

Open‑seat boarding remains a hallmark of the Southwest experience. Instead of pre‑assigned seats, you are assigned a boarding group and position, then choose any available spot once you step onto the plane. Some travelers find the process chaotic, but regulars appreciate the flexibility—and families with young children board early. Southwest’s no‑change‑fee policy (you pay only the fare difference) is another huge selling point because plans can shift without the penalty that often wipes out the savings on a budget ticket.

From Phoenix Sky Harbor, Southwest flies non‑stop to more than 60 destinations including Denver, Las Vegas, Chicago Midway, Dallas Love Field, and Baltimore. During the winter months it also runs seasonal routes to popular sun‑seeker markets. Rapid Rewards loyalty members can earn points toward future flights, and the Companion Pass—earned after flying 100 qualifying one‑way flights or accumulating 135,000 points in a calendar year—lets a designated companion fly with you for just the taxes on every booking. For Gilbert residents who travel often, that perk can be transformative.

Learn more about current routes and the Rapid Rewards program on the Southwest Airlines website.

Spirit Airlines: Ultra‑Low Base Fares, With an à La Carte Menu

Spirit Airlines is the textbook definition of an ultra‑low‑cost carrier (ULCC). Its business model strips the fare down to the seat itself—everything else from a carry‑on bag to a bottle of water costs extra. That makes Spirit an excellent choice for travelers who can pack light and are willing to forgo frills in exchange for a rock‑bottom ticket price.

Spirit’s bright yellow planes are a familiar sight at Phoenix Sky Harbor’s Terminal 4, where it flies to a network of about 20 non‑stop destinations including Atlanta, Detroit, Minneapolis, and Orlando. One‑way base fares often dip below $40 during sales, but the final price climbs quickly once you add a carry‑on bag (typically $40‑$65 each way if paid at booking), a checked bag, and a seat assignment. The airline’s Bare Fare covers only a small personal item that fits under the seat. By contrast, its big front seats in the first two rows offer as much legroom as domestic first class for a fraction of what a legacy carrier charges.

Spirit has spent recent years upgrading its fleet and improving on‑time performance, shedding its old reputation for chronic delays. The airline also offers a paid membership club, the $9 Fare Club, which grants early access to deep‑discount fares and reduces baggage fees. If you fly Spirit even twice a year, the membership often pays for itself. Just keep in mind that alterations to an existing booking can be costly unless you purchase the optional Flight Flex bundle at checkout.

To browse route maps and join the fare club, visit the Spirit Airlines website.

Frontier Airlines: Kids Fly Free and the Discount Den

Frontier Airlines follows a ULCC playbook similar to Spirit’s, but it has carved out its own identity with a few unique programs that can be particularly valuable for Gilbert families. Like Spirit, Frontier charges for carry‑ons, checked bags, and seat selection on its standard “Basic” fare. However, the airline’s Kids Fly Free promotion—available to Discount Den members—allows one child under 15 to fly free with an adult’s paid round‑trip ticket on select flights. The Discount Den costs $99 per year and also unlocks lower fares and reduced fees similar to Spirit’s $9 Fare Club.

Frontier operates from Phoenix Sky Harbor’s Terminal 4 and serves roughly 15 non‑stop markets, with a heavy emphasis on leisure destinations such as Orlando, Las Vegas, Denver, and Cancún (seasonal). Its fleet is among the youngest in the country, which helps keep fuel costs down and fares low. Frontier frequently runs 90‑%‑off flash sales that drop base fares to less than $20; signing up for email alerts is the easiest way to catch these promotions.

The trade‑off: Frontier’s seats are slim and recline‑free, and legroom is tight at 28‑30 inches of pitch for standard rows. Stretch seating in the front of the plane is sold as an upsell and offers about 35‑38 inches of pitch. If you’re a taller traveler or simply value a little more breathing room, factor that upgrade cost into your comparison math before assuming Frontier is the cheapest door‑to‑door option.

Program details and route maps are available on the Frontier Airlines website.

Allegiant Air: The Hometown ULCC at Mesa Gateway

For many Gilbert residents, Allegiant Air is the most geographically convenient budget carrier because its hub at Phoenix‑Mesa Gateway Airport sits just a dozen miles away. Allegiant operates a point‑to‑point model rather than a traditional hub‑and‑spoke system, which means it connects mid‑sized cities that other airlines often overlook. From AZA you can fly non‑stop to roughly 40 destinations, including Provo, Grand Rapids, Knoxville, and Bellingham—markets where non‑stop service would otherwise be rare.

Allegiant’s ultra‑low‑cost structure is similar to Spirit and Frontier: you pay for the seat, and everything else—checked bags, carry‑ons, seat assignments, even a printed boarding pass—is optional and carries a fee. The airline bundles vacation packages that combine airfare, hotel, and rental car at an aggressively low price, which can simplify trip planning for leisure travelers. One advantage Allegiant holds over other ULCCs is that many of its routes are less than two hours long, so the lack of in‑flight amenities bothers customers less.

Parking at Mesa Gateway tends to be cheaper than at Sky Harbor, and security lines move quicker because the airport is smaller. That translates into less time spent waiting and more money left in your pocket. Check the airline’s Deals page often—Allegiant runs $39 one‑way specials with regularity, although taxes and fees can boost the final figure by $30‑$50 round‑trip.

Explore routes and packages at the Allegiant Air website.

Tips for Unearthing the Absolute Lowest Fares from Gilbert

Even with an array of budget airlines available, the difference between an okay fare and a truly great one often comes down to a handful of booking habits.

  • Compare both airports. A flight from Sky Harbor and a flight from Mesa Gateway on the same day can vary by $50‑$100. Use a meta‑search tool like Google Flights or Skyscanner and select “PHX” and “AZA” simultaneously. You may find that flying out of one airport and returning to the other cuts the cost even further.
  • Book 30‑60 days out. Data from fare‑tracking services shows that domestic leisure fares bottom out 4‑8 weeks before departure. Last‑minute tickets on budget airlines can still be inexpensive during off‑peak periods, but demand spikes around holidays quickly erase those bargains.
  • Fly on Tuesdays or Wednesdays. Mid‑week flights see lighter demand, which typically means lower fares. If you can shift your trip by a day or two, you’ll often pocket meaningful savings.
  • Use airline‑specific alerts. Spirit, Frontier, and Allegiant all offer price‑watch tools or email lists. Because these carriers run flash sales that last 24‑48 hours, having notifications turned on gives you a head start.
  • Check the total cost with bags. A $29 fare stops being a deal if you’re paying $120 round‑trip for a carry‑on. Before you click “buy,” add the fees for whatever you know you’ll bring. Sometimes Southwest’s $149 fare with free luggage beats a $59 ULCC fare plus fees.

An often‑overlooked tip: clear your browser cookies or use incognito mode. While dynamic pricing on airline websites is mostly based on real‑time demand, repeat searches can occasionally trigger a modest price hike. The practice is less common today, but it costs nothing to hedge against it.

Getting to the Airport Without Spending a Fortune

Door‑to‑door car travel dominates Gilbert, but there are ways to avoid pricey on‑airport parking or surge‑priced rideshares. The Valley Metro Light Rail does not extend directly to Gilbert, but you can park at the Mesa Dr/Main St park‑and‑ride (free) and ride the rail to the 44th St/Washington station, which connects to the free PHX Sky Train. A one‑way $2 ticket beats most alternatives. For Mesa Gateway, you are currently limited to driving, rideshare, or an airport shuttle van. The airport’s economy lot charges $8‑$12 per day, and a free shuttle covers the short distance to the terminal.

Rideshare services Uber and Lyft provide reliable service from Gilbert to both airports. A mid‑day trip to Sky Harbor usually runs $25‑$35, while Mesa Gateway tends to be $18‑$28. Splitting the fare among travel companions can bring the per‑person cost close to what you’d pay for long‑term parking.

Inside the Terminals: Amenities That Won’t Break the Bank

Sky Harbor’s Terminal 4—home to Southwest, Spirit, and Frontier—has dozens of restaurants and shops, but prices mirror typical airport inflation. Instead of buying a $15 sandwich, pack your own dry snacks; TSA allows solid food through security. Water bottle refill stations are located near the restrooms so you can avoid $5 bottles of water. Free Wi‑Fi and abundant charging outlets are available throughout all terminals, so you can stay connected before your flight at no extra cost.

Mesa Gateway’s terminal is compact but functional. It has a single concourse with a café and a bar, but most travelers eat before arriving or bring food because the limited selection gets crowded during boarding peaks. Self‑service kiosks for Allegiant flights move quickly, and gate seating is rarely hard to find.

Decoding Budget Airline Fees: What to Watch For

A $39 ticket rarely stays $39 after you finish the checkout process. Understanding the most common add‑ons can prevent sticker shock and help you accurately compare offers across airlines.

Baggage fees are the biggest variable. Personal items (a small backpack or purse) are free on all four carriers, but a full‑sized carry‑on that goes in the overhead bin can cost $30‑$65 each way on Spirit, Frontier, and Allegiant if you pay at the airport. Pre‑paying online typically reduces the fee by $10‑$15 per segment. Checked bags follow a similar structure: first bags often run $35‑$40, second bags $45‑$55. Southwest remains the outlier with its two free checked bags.

Seat selection fees range from $5 to $50 per segment depending on location and legroom. If you don’t pay, the airline will assign you a seat at check‑in, which might mean you and your travel partner end up on opposite ends of the aircraft. Families should know that airlines are required by DOT policy to seat children under 13 with an accompanying adult at no extra charge, but it’s wise to check the specific airline’s policy.

Booking fees are a quirky holdover on a few carriers. Allegiant tacks on an “Electronic Carrier Usage Charge” of $22 per passenger, per segment unless you book at the airport counter in person—an option few travelers can take advantage of. Frontier and Spirit do not charge a separate booking fee, but discounted fares may be restricted to online purchases.

Change and cancellation policies range from generous (Southwest) to punitive unless you buy a flexibility add‑on (Spirit’s Flight Flex, Frontier’s The WORKS bundle). Allegiant charges $75 per segment for changes, which can destroy the value of a cheap ticket if your plans shift.

Frequently Asked Questions About Budget Flying from Gilbert

Is it always cheaper to fly from Mesa Gateway than Sky Harbor?

Not always. Allegiant often offers lower base fares from Mesa Gateway, but when Southwest runs a sale or you find a price‑matched Frontier ticket at Sky Harbor, the difference shrinks or disappears. Factor in your transportation costs to each airport, too; for many Gilbert residents, Mesa Gateway is closer and cheaper to reach.

How far in advance should I book a budget airline ticket?

Aim for 4‑8 weeks before travel for the best balance of price and availability. ULCCs sometimes drop prices 2‑3 weeks out if seats are empty, but peak‑season flights to beach destinations or ski towns sell out early. Set fare alerts so you can jump on a good price whenever it appears.

Can I bring a carry‑on bag without paying extra on Spirit, Frontier, or Allegiant?

Only if the bag qualifies as a personal item (typically 18”x14”x8” or smaller). A standard roll‑aboard suitcase that goes in the overhead bin will incur a fee. Measure your bag against the airline’s published dimensions; gate agents are strict because the revenue from carry‑on fees supports the low base fare model.

What’s the cheapest month to fly from the Phoenix area?

September and late January tend to be the cheapest windows because they fall between holiday rushes and summer vacation peaks. You’ll often see $39‑$49 one‑way fares to cities like Denver or Las Vegas during these periods. Immediately after the New Year, demand drops and airlines respond with aggressive sales.

Do any budget airlines serving Gilbert offer first‑class seats?

True domestic first class is not available on Frontier, Spirit, or Allegiant, but Spirit’s Big Front Seat and Frontier’s Stretch seating deliver extra legroom and a wider seat at a fraction of what legacy carriers charge. Southwest does not have a first‑class cabin, but its Business Select fare includes priority boarding, a free drink, and extra Rapid Rewards points.

Making the Most of Gilbert’s Budget Airline Options

Gilbert residents occupy a sweet spot between two airports that host a full spectrum of low‑cost and ultra‑low‑cost carriers. By mixing loyalty perks from Southwest with ultra‑cheap base fares from Spirit, Frontier, or Allegiant, you can assemble a travel portfolio that matches each trip’s priorities—whether that’s rock‑bottom price, maximum luggage, or the fastest non‑stop route. The secret is to think about the total door‑to‑door cost, not just the ticket price, and to use the tools and alerts that keep you a step ahead of fare increases.

From free checked bags on Southwest to Allegiant’s non‑stop leisure routes out of Mesa Gateway, the options are richer than they might first appear. With a little planning and a willingness to compare airports, Gilbert’s air travelers can routinely snag fares that make the valley feel a lot more connected to the rest of the country—without draining their bank accounts.