What is the cheapest airline?

There isn’t one airline that is always the cheapest. The lowest price depends on your route, travel dates, baggage needs, seat selection, and even which airport you use. In many cases, ultra-low-cost carriers offer the cheapest base fares, but the total cost can change quickly once fees are added.

Short answer

If you mean the airline that most often offers the lowest starting price, these are usually among the cheapest options by region:

Region	Airlines often known for low fares	Notes
United States	Spirit, Frontier, Allegiant	Very low base fares, but fees for bags, seats, and extras can add up
Europe	Ryanair, Wizz Air, easyJet, Vueling	Often the cheapest for short-haul travel
Asia	AirAsia, Scoot, IndiGo, VietJet Air, Jetstar	Strong budget options, especially for regional routes
Latin America	Volaris, Viva Aerobus, JetSMART, Flybondi, Arajet	Common low-cost choices depending on route
Middle East / Africa	Air Arabia, flydubai	Often competitive on short- and medium-haul flights

If you want a single-name answer for bare-bones fares, airlines like Spirit, Frontier, Ryanair, Wizz Air, and AirAsia are frequently among the cheapest. But the cheapest airline for your trip may be different.

Why there is no universal cheapest airline

The cheapest airline is not the same for every route because prices change based on:

Distance and demand — popular routes can be cheaper when airlines compete
Travel dates — midweek and off-season flights are often lower
Baggage rules — a cheap ticket can become expensive after bag fees
Airport choice — secondary airports may have lower fares
Sales and promos — full-service airlines sometimes run fares below budget carriers
Ancillary fees — seat selection, carry-ons, and onboard extras can change the final price

In other words, the airline with the lowest headline fare is not always the airline with the lowest total trip cost.

Cheapest airline vs. cheapest trip

A low-cost airline may look like the cheapest option at first, but the total price can rise fast if you need extras.

Common add-ons that increase the cost

Checked baggage
Carry-on bags
Seat selection
Priority boarding
Printing or airport check-in fees
Payment processing or booking fees

For example, a $39 ticket can end up costing more than a $79 ticket once bags and seat fees are included. That is why the cheapest airline is often the one with the lowest all-in price, not just the lowest base fare.

How to find the cheapest airline for your trip

If your goal is to pay as little as possible, use this process:

Compare total price, not just base fare
Add baggage, seat selection, and taxes before deciding.
Check multiple airlines and booking sites
Search directly on airline websites and on flight comparison tools.
Be flexible with dates
Moving your trip by one or two days can save a lot.
Try different airports
Nearby airports may have much cheaper fares.
Travel light
If you can fly with only a personal item, budget airlines become much more attractive.
Look for sales and fare alerts
Budget airlines and major carriers both run promotions.
Book the right trip length
For short trips, low-cost carriers often win. For longer trips, a major airline sale may be cheaper after fees.

When budget airlines are the best deal

Budget airlines are usually the best choice when:

You are flying short-haul
You can pack very light
You do not care about seat selection
You are flexible on flight times
You are okay with basic service

They are often less ideal when:

You need checked bags
You are traveling with family and want assigned seats
You have tight connections
You want included meals, flexibility, or better customer service

Best value airlines are not always the cheapest airlines

Sometimes the lowest-cost option is not the best overall value. For example:

Southwest may not always have the lowest base fare, but it can be cheaper overall if you need bags
A full-service airline sale can beat a budget carrier once fees are included
A low-cost airline may be cheapest only if you travel with minimal extras

So when asking, “What is the cheapest airline?” the better question is often: Which airline is cheapest for my route, on my dates, with my bags?

Best way to compare airlines fairly

Use this checklist before booking:

Total fare after taxes
Carry-on and checked bag policies
Seat assignment costs
Change and cancellation rules
Airport location and transfer time
On-time performance
Customer support and flexibility

This gives you a more accurate answer than comparing the first price you see.

Frequently asked questions

What airline usually has the cheapest flights?

On many short-haul routes, ultra-low-cost carriers usually have the cheapest fares. In the U.S., that often means Spirit or Frontier. In Europe, it is often Ryanair or Wizz Air. In Asia, AirAsia is frequently very competitive.

Is the cheapest airline always the worst?

Not always. Budget airlines can be perfectly fine if you know what to expect. The main downside is usually the extra fees and less flexibility, not necessarily safety or reliability.

Is Southwest a cheap airline?

Southwest is often a strong value airline rather than the absolute cheapest. It can be a smart choice if you need checked bags or want fewer surprise fees.

What is the cheapest time to book?

There is no perfect rule, but prices are often lower when you book early enough to avoid last-minute demand and when you fly on less popular days, such as Tuesday or Wednesday.

Are budget airlines safe?

Yes, budget airlines are generally required to meet the same safety standards as other airlines. The difference is usually in pricing, service, and fee structure.

Bottom line

There is no single cheapest airline for every trip. If you want the lowest base fare, airlines like Spirit, Frontier, Ryanair, Wizz Air, and AirAsia are often among the cheapest. If you want the lowest total cost, compare baggage fees, seat charges, and airport options before booking.

The best answer to “what is the cheapest airline?” is: the one that gives you the lowest all-in price for your specific route and travel needs.