The $39 Fare Trap: What Cheap Flights to Las Vegas Really Cost
First, an obituary. The airline that perfected the $39 fare, Spirit, ceased operations on May 2, 2026, after 34 years of teaching America that a flight could cost less than the taxi to the airport. The yellow planes are gone. The business model is not: Frontier and Allegiant run the same playbook on Las Vegas routes today, and the big airlines have quietly adopted its worst habit while charging legacy prices. This page itemizes the trap with the airlines' own published fees, every figure checked against official fee pages on October 25, 2026.
How the trap works
The headline fare buys a seat and a personal item that fits under it. Everything else (the carry-on over your head, the checked bag under the plane, the seat you pick, boarding before the bins fill) is a separate toll, priced dynamically and revealed late. Two of the six airlines below refuse to publish their bag prices at all outside a booking-flow calculator. That is not an oversight; it is the product.
What each airline actually charges
Frontier: the price they will not print
| Item | Published fee (Oct 2026) |
|---|---|
| Personal item (8 x 18 x 14 in.) | Free |
| Carry-on bag | Not published. Frontier's fee page sends you to its Bag Price Checker; the price depends on route and date |
| Checked bag (max 40 lb, not 50) | Not published outside the checker. Overweight: $75 at 41 to 50 lb; $100 at 51 to 99.99 lb, rising to $129 for bookings from April 4, 2026. Oversized: $75 |
| Seat selection | From $15 per segment; random assignment is free |
| Boarding | Board First $2.99 to $14.99 (requires a purchased carry-on); Priority Boarding $0.99 to $9.99 |
| Bundles | From $29 per direction. The Economy bundle (carry-on, standard seat, no change or cancel fee) is usually the honest comparison against other airlines |
Allegiant: everything has a range, and the airport is the top of it
| Item | Published fee (Oct 2026) |
|---|---|
| Personal item (8 x 14 x 18 in.) | Free |
| Carry-on bag | $10 to $75 per segment by route and timing; $75 at the airport |
| Checked bag (up to 50 lb) | $15 to $70 each way bought before departure; $75 each way at the airport. Overweight adds $50 (51 to 70 lb) or $75 (71 to 100 lb) |
| Seat selection | $0 to $80 per segment; random assignment free |
| Priority Access boarding | $11.50 to $17.50 |
Southwest: no longer free bags, still free carry-ons
| Item | Published fee (Oct 2026) |
|---|---|
| Personal item and carry-on | Free for everyone |
| Checked bags | $45 first, $55 second, each way, since April 9, 2026 (introduced May 28, 2025). Free bags survive on Choice Extra fares, for A-List Preferred (both bags), A-List and Southwest credit card holders (first bag), and military (both) |
| Seat | Assigned seating since January 27, 2026; which seat class you can pick is set by your fare (Basic is assigned at check-in, Choice Extra includes extra legroom) |
| Priority Boarding | $10 to $75 per segment |
The legacies: carry-ons free, bags up again in 2026
| Airline | Carry-on | Checked bags (each way) | The catch |
|---|---|---|---|
| Delta | Free, plus personal item | $45 / $55, raised from $35 / $45 on April 8, 2026 | Main Basic seats are assigned free after check-in; buying a seat in advance costs extra |
| United | Free in regular Economy | About $50 / $60 standard, $45 / $55 prepaid, per its fee calculator (domestic, post April 3, 2026 increase) | Basic Economy is personal item ONLY. Checking that carry-on costs $45 prepaid, $50 at the lobby, $75 at the gate. Premier Access from $24 |
| American | Free, plus personal item | $50 / $60, or $45 / $55 paid online, since May 18, 2026 | Basic Economy pays $5 more per bag. Preferred Seats $4 to $139; Priority boarding $9 to $74 |
The $39 fare, itemized
Take a $39 each-way headline fare ($78 roundtrip) on a published-range airline and add a normal traveler's load: a carry-on, one checked bag, and a chosen seat, bought the smart way during booking. On Allegiant's published ranges the add-ons alone run $50 to $450 roundtrip (carry-on $20 to $150, checked $30 to $140, seats $0 to $160), landing the real ticket between about $128 and $528 before the airport coffee. Buy the same bags at the airport instead and the two bags alone cost $300 roundtrip. Meanwhile a $149 Southwest fare with a free carry-on and a $45 checked bag each way totals $239 all-in, set in stone at booking. Sometimes the budget fare still wins. Often, at the times people actually fly to Vegas, it quietly does not.
2026: the year every airline raised the bag fee
- April 3, 2026: United raises domestic bag fees; Basic Economy carry-on check fees climb to $45/$50/$75 by purchase point.
- April 4, 2026: Frontier's heavy overweight fee (51 to 99.99 lb) rises from $100 to $129.
- April 8, 2026: Delta's first bag goes $35 to $45, second $45 to $55.
- April 9, 2026: Southwest's standard bag prices become $45/$55. American steps up the same day.
- May 18, 2026: American moves to $50/$60 ($45/$55 online) and adds a $5 Basic Economy step-up.
- May 2, 2026: in the middle of it all, Spirit stops flying entirely.
How to beat the trap
- Travel personal-item-only when you can. An 18 x 14 x 8 in. bag is free on every airline here. Our Las Vegas packing list is built around making a weekend fit in one.
- Compare totals, not headlines. Fare plus carry-on plus checked plus seat, roundtrip, on the budget carrier versus Southwest and at least one legacy. Five minutes, real money.
- Buy add-ons during booking, never at the airport. The airport price is the punishment price on every fee table above.
- Weigh the bag at home. Frontier checks at 40 lb where others allow 50; a $12 luggage scale beats a $75 overweight fee.
- Check the bundle before the parts. Frontier bundles start at $29 per direction and the Economy tier often undercuts its own a la carte list.
- Bring the right plastic. Southwest's own credit card restores a free first checked bag; United's qualifying cards restore a free carry-on in Basic Economy. The annual fee math works if you fly either twice a year.
Fees verified October 25, 2026 against each airline's official fee pages (Frontier optional services, Allegiant optional services and fees, Southwest travel fees, Delta baggage, United baggage and carry-on pages, American optional service fees). Frontier and United bag prices vary by route and date inside their calculators; ranges shown are the published ones.
Frequently asked questions
Why do budget airlines not publish their bag prices?
Because the price depends on your route, your date and when you buy, and a vague price converts better than a scary one. Frontier's official fee page literally sends you to a Bag Price Checker instead of printing a number, and United does the same with its calculator. The trap is that you only see the real total deep inside the booking flow, after you have already chosen the flight in your head.
What is the single most expensive mistake on a cheap flight?
Buying bags at the airport. Allegiant charges $75 each way per bag at the airport for carry-ons and checked bags alike, against pre-departure prices that start at $10 to $15. United charges Basic Economy passengers $75 to check a carry-on at the gate. Every one of these fees is cheapest during booking and most expensive at the airport, by design.
Is Southwest still the free bags airline?
Not since 2025. Southwest introduced checked bag fees for tickets booked from May 28, 2025, and since April 9, 2026 the standard prices are $45 for the first bag and $55 for the second each way. Carry-ons and personal items are still free, assigned seating started January 27, 2026, and two bags remain free only on the top Choice Extra fare, for A-List Preferred members, and on vacation packages; A-List members and Southwest credit card holders get the first bag free.
How do I actually fly cheap to Las Vegas now?
Travel with a personal item only and the headline fare is real; our packing list is built for exactly that. If you need bags, price the whole trip (fare plus bags plus seat) on the budget carrier against Southwest and the legacies before you book, buy every add-on during booking, and weigh your bag at home: Frontier's checked limit is 40 pounds, not the 50 almost everyone else allows, and overweight fees start at $75.