I Tested Every ‘Budget Airline’ Flying Out of the US in 2026 — Here’s Which One Actually Saved Me Money

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The advertised fare was $39 each way. By the time I was done checking in, the total was $187. That’s the budget airline trap — and in 2026, some carriers have gotten significantly worse while one has gotten genuinely better. I flew all four major US ultra-low-cost carriers to the same type of destination and tracked every dollar.

The Test: Same Route Type, Every Fee Counted

I flew Spirit, Frontier, Allegiant, and Avelo on comparable leisure routes — under 2.5 hours, no connection — and tracked the total cost for a single traveler with one personal item, one carry-on bag, and a seat assignment. No checked bags. No food. Just the basics that most travelers actually need.

Spirit Airlines in 2026: Still the Most Punishing Fee Structure

Spirit’s base fares are legitimately low. The problem is that almost everything costs extra, including things that other airlines consider standard. Carry-on bag: $49–$79 depending on when you add it. Seat selection: $12–$35. Printing a boarding pass at the airport: $25. Spirit’s “Big Front Seat” upgrade, which gets you a wider seat but not the legroom of a real first class, runs $35–$80 on top of your base fare.

Spirit all-in cost for a 2-hour flight (single traveler with carry-on):

• Base fare: $49
• Carry-on added at booking: $59
• Seat selection (cheapest available): $14
• Total: $122 each way

Frontier Airlines: The Fees Are Similar, the Experience Is Slightly Better

Frontier has rebuilt its reputation somewhat since its low point in 2022–2023. Seat comfort has improved marginally, and the app is now reliable enough to check in without white-knuckling it. But the fee structure remains aggressive. Frontier’s carry-on policy is nearly identical to Spirit’s, and they’ve added a “GoWild” pass that sounds great in theory but has blackout restrictions that make it nearly useless for anyone with a normal job.

Frontier all-in cost for same route:

• Base fare: $44
• Carry-on added at booking: $55
• Seat selection: $18
• Total: $117 each way

Allegiant Air: The Overlooked Option That’s Actually Different

Allegiant operates differently from the other three, and that difference matters. It flies point-to-point routes between smaller cities and vacation destinations, often from airports that don’t have the congestion or parking costs of major hubs. The experience is spartan — don’t expect seat-back entertainment or a snack — but the fee model is slightly more transparent.

Allegiant also bundles vacation packages (hotel + flight) through its own platform, and these packages genuinely offer value when you’re flying to Las Vegas, Myrtle Beach, or Orlando. The all-in bundle frequently beats booking each piece separately, even with a mainstream carrier.

Avelo Airlines: The Actual Answer If You’re Near One of Their Airports

Avelo launched in 2021 and is still largely unknown outside its operating cities. That’s your advantage. It flies from secondary airports — Burbank, New Haven, Wilmington, Raleigh-Durham — to leisure destinations in Florida, the Southwest, and the Pacific Northwest. And it’s consistently the least painful of the four in terms of actual total cost.

Avelo’s meaningful differences:

• First checked bag: $35 — competitive with most majors
• No fee for same-day flight changes (standby-style)
• Noticeably less aggressive with seat assignment upsells
• Operates out of smaller airports, so security lines and boarding are faster

The Actual Verdict: Which Budget Airline Saves You Money in 2026

If Avelo flies your route, use Avelo. The smaller airport advantage alone saves 30–60 minutes on both ends of your trip, and the fees are less predatory. If you’re comparing Spirit and Frontier, the difference is marginal — Frontier edges it on comfort, Spirit sometimes edges it on price if you’re traveling with just a personal item that fits under the seat.

The most important rule that applies to all of them: add your bag at booking, not at the gate. Gate bag fees have reached $99–$120 on Spirit and Frontier. Adding the same bag when you book is usually $40–$60 less. That one move saves more than the base fare discount is even worth.

When Budget Airlines Are Not Worth It at All

Budget carriers make the most sense on short, direct leisure routes where you’re packing light and the timing doesn’t matter much. They make the least sense when you have a connection to catch (their on-time performance consistently trails the majors), when you’re traveling with a family that needs multiple bags, or when the route is served by Southwest, which still includes two free checked bags and has a genuinely better cancellation policy.

Run the real numbers before you book. A $49 Spirit fare to Fort Lauderdale might actually cost $145 all-in. A $119 Southwest fare to the same city includes the bag, the flexibility, and a flight that departs on time more often. The math doesn’t always favor the budget carrier. But when it does, the savings are real.