A $79 airfare is not necessarily cheaper than a $129 airfare.
The difference can disappear once you add a carry-on, choose a seat or check a suitcase. Airline pricing in 2026 makes comparing the headline fare increasingly unreliable because the cheapest fare class on one airline may include something another carrier charges separately for.
The useful question is not which airline advertises the cheapest ticket. It is which airline gives you the lowest total price for the trip you actually intend to take.
The Short Answer
No major U.S. airline is completely free of add-on charges, and there is no single airline with the fewest fees for every traveler.
Delta, American, JetBlue and Southwest are relatively straightforward if you travel with a normal carry-on because they include one with their lowest economy fares. United is the important exception among the large network airlines: on most domestic Basic Economy tickets, United includes a personal item but not a full-size carry-on.
Frontier can still be extremely cheap for a traveler carrying only a small personal item and accepting an assigned seat. Once you start adding an overhead bag, checked luggage and seat selection, however, the useful comparison is between Frontier’s completed price and the fare another airline already includes.
Airline Fee Comparison for a Typical U.S. Trip
| Airline | Personal Item | Carry-On | 1st Checked Bag | Advance Seat Selection on Cheapest Fare |
|---|---|---|---|---|
| Delta | Included | Included | Commonly $45 domestic | Usually not included with Main Basic |
| American | Included | Included | Basic Economy generally $50 online / $55 at airport on many U.S. itineraries | Available for a fee on Basic Economy |
| United | Included | Not included on most domestic Basic Economy tickets; important route and status/card exceptions apply | Varies by itinerary; use United’s calculator | Generally costs extra on Basic Economy |
| JetBlue | Included | Included | From $45 off-peak when purchased early | Not included with Base fare |
| Southwest | Included | Included | $45 on most lower fares for applicable U.S. mainland travel | Basic gets a Standard seat assigned at check-in |
| Frontier | Included | Costs extra on Basic fare | Costs extra on Basic fare | Costs extra on Basic fare |
Fees can vary by route, travel date, ticketing date, fare class, elite status and credit-card benefits. Use this table to understand the basic structure, then check the final price for your actual itinerary before booking.
Southwest Is No Longer the Automatic Winner for Checked Bags
For years, Southwest had an obvious advantage for anyone checking luggage: two checked bags were included. That is no longer the standard deal for most passengers.
For U.S. mainland travel booked, ticketed or changed on or after April 9, 2026, Southwest lists a $45 first checked bag and $55 second checked bag for Basic, Choice and Choice Preferred fares. Choice Extra includes two checked bags, while certain Rapid Rewards elite members and eligible credit-card holders receive additional bag benefits.
You can check the current charges on Southwest’s optional travel charges page.
Southwest still includes a carry-on and personal item. Its seating system has changed as well: assigned seating began for travel on January 27, 2026, and Basic passengers generally receive a Standard seat assignment at check-in rather than choosing a seat when booking.
That means Southwest can still be a good value, but you should no longer assume it wins automatically simply because you are checking luggage.
Delta: Carry-On Included, Checked Bag Extra
Delta remains relatively simple for a traveler who can fit everything into a carry-on. Delta permits one carry-on and one personal item, while its current common domestic fee for travelers without a qualifying exemption is $45 for the first standard checked bag and $55 for the second.
Delta publishes its current baggage charges here.
The larger limitation on Delta’s cheapest Main Basic fare is seating. A seat is generally assigned after check-in unless you pay for an eligible advance assignment, and Main Basic also comes with restrictions on flexibility, mileage earning and upgrades.
For a solo traveler with a carry-on who does not care where they sit, Main Basic can still be a clean low-cost option. Add checked luggage and paid seat selection, and the price difference from a more inclusive fare can shrink quickly.
American: Watch the Difference Between Main Cabin and Basic Economy
American includes one personal item and one full-size carry-on even on Basic Economy. The bigger cost difference appears when you check luggage.
For Basic Economy tickets issued on or after May 18, 2026 on many itineraries within the U.S. and nearby markets, American lists the first checked bag at $50 when paid online and $55 at the airport. Standard Main Cabin pricing can be lower.
American’s checked-bag page has the route- and ticket-date-specific details.
Basic Economy also does not include complimentary advance seat choice for most travelers. You can purchase a specific seat or accept the free seat assignment provided at check-in.
This is exactly the kind of fare where a $20 or $30 headline discount can vanish if you buy back the benefits you actually want.
United: Basic Economy Can Change the Carry-On Math
United deserves special attention because its Basic Economy carry-on rules differ from those of Delta and American.
On most domestic United Basic Economy tickets, you can bring a personal item that fits under the seat, but a normal full-size carry-on is not included. That can materially change a fare comparison if you travel with a roller bag.
There are important exceptions. Basic Economy passengers on transatlantic and transpacific itineraries and routes to South America receive a carry-on. MileagePlus Premier members, certain companions, Star Alliance Gold members and eligible United credit-card holders can also have different carry-on benefits.
Checked-bag pricing also varies by route, ticketing date and passenger status rather than fitting neatly into one national price. Use United’s checked-bag calculator with the actual itinerary before deciding which fare is cheaper.
United Basic Economy also generally restricts complimentary advance seat selection. If you want a carry-on, a specific seat and more flexibility, compare the cost of standard Economy rather than automatically buying Basic Economy and adding extras afterward.
JetBlue: Carry-On Included, But Base Is Still Stripped Down
JetBlue’s Base fare includes a carry-on bag, which makes the baggage comparison simpler than it is with domestic United Basic Economy. What Base does not include is advance seat selection.
JetBlue’s current fare structure lists a carry-on across Base, Standard and Flex options, while Standard and Flex include seat selection. JetBlue’s fare comparison explains the current differences.
Checked baggage still costs extra for most economy passengers. For many U.S., Latin America, Caribbean and Canada itineraries, JetBlue currently lists an off-peak first checked bag at $45 when added more than 24 hours before departure, with higher prices during peak periods and closer to departure.
JetBlue’s current fee schedule is worth checking before booking because timing and season can affect the price.
Frontier: Basic Is Cheap Because Very Little Is Included
Frontier’s Basic fare includes a personal item. A normal carry-on, checked suitcase and advance seat assignment cost extra.
That can be an excellent deal for someone taking a short trip with a backpack and accepting whichever seat is assigned. It can be much less attractive for a traveler who intends to purchase several extras.
Frontier’s Economy bundle includes a personal item, carry-on bag, standard seat selection and no change or cancellation fee. Premium adds premium seating and priority boarding, while Business includes two checked bags and its higher-tier seating benefits.
Frontier lists its current bundle benefits here.
Frontier uses variable baggage pricing, so there is no single carry-on or checked-bag price that works for every flight. The airline says bags are generally cheapest when purchased earlier, making the timing of the purchase part of the fare calculation.
Who Has the Fewest Fees Depends on What You Carry
If You Travel With Only a Personal Item
Frontier can be particularly competitive because its Basic fare already includes the one thing you need. If you can genuinely travel with only a small under-seat bag and do not care about seat assignment, there may be very little to add.
If You Travel With a Carry-On
Delta, American, JetBlue and Southwest are simpler because a normal carry-on is included with their lowest economy products. With United Basic Economy, check the itinerary carefully because the carry-on allowance depends on the route and any qualifying status or card benefits.
With Frontier, add the carry-on charge or compare the Economy bundle before deciding which fare is really cheaper.
If You Check a Bag
Do the round-trip math before booking. A $45 first checked-bag fee becomes another $90 on a round trip before you consider a second bag, overweight charges or other extras.
And do not rely on the old assumption that Southwest automatically includes checked bags for everyone. Its lower fare classes now charge for them on applicable U.S. mainland itineraries.
If You Need to Choose Your Seat
The cheapest fare class often becomes less attractive when a specific seat matters to you.
Instead of automatically buying a stripped-down fare and then adding a bag and seat separately, compare the next fare class or bundle. Sometimes the more inclusive fare costs less than purchasing each extra à la carte.
A $99 Fare Versus a $149 Fare
Suppose Airline A advertises a $99 one-way fare while Airline B charges $149.
| Airline A | Airline B | |
|---|---|---|
| Base fare | $99 | $149 |
| Carry-on | $45 | Included |
| Seat selection | $25 | Included |
| Real one-way cost | $169 | $149 |
The apparently more expensive fare is actually $20 cheaper for that traveler.
Change the traveler to someone carrying only a backpack who does not care about seat assignment, and Airline A goes back to costing $99. The same airfare can therefore be a bargain for one traveler and poor value for another.
How to Compare Cheap Flights Without Getting Fooled by the Headline Price
Before choosing between two fares, price the trip all the way through with the things you genuinely expect to use:
- Personal item allowance
- Carry-on bag
- Checked luggage
- Seat selection
- Family seating needs
- Change or cancellation flexibility
- Airport transportation
- Credit-card and elite-status benefits
Then compare the totals.
This is the same principle behind our guide to the hidden costs of cheap flights. The goal is not to avoid low-cost carriers. It is to stop comparing incomplete prices.
One Fee That Is Particularly Easy to Avoid
Overweight-bag charges are among the least productive ways to spend travel money.
Frontier, like other airlines, imposes additional charges when a checked bag exceeds its standard weight allowance. If you check luggage regularly, weighing the suitcase at home before leaving for the airport is a cheap precaution.
It also gives you time to redistribute heavy items instead of discovering the problem while standing at the ticket counter.
Compare the Trip You Are Actually Taking
The cheapest airline for a weekend traveler carrying a backpack may be the most expensive choice for a family checking several bags.
Instead of asking which airline has the fewest fees in the abstract, ask which airline gives you the lowest final price for the baggage, seating and flexibility you actually need.
Once you compare fares that way, some supposedly cheap flights stop looking cheap. Others turn out to be every bit as inexpensive as the headline price suggested.