Allegiant Air vs Southwest Airlines: fleets and facts compared
Allegiant Air (United States) and Southwest Airlines (United States) side by side: fleet size, main aircraft type, founding year, hubs and status, each from our database with its source and date. Both list Harry Reid International Airport as a hub or base.
- 124Allegiant Air fleet, as of 30 June 2026
- 803Southwest fleet, as of 30 September 2026
- 1shared hub
- United States · Hubs LAS · AZA · SFB +3 · founded 1998Active
- United States · Hubs DEN · LAS · MDW +3 · founded 1971Active
At a glance
Each fact from our database. A grey tint marks the larger value in a row; it is not a verdict.
Shared hub, outlined above: LAS.
Data last updated: Allegiant Air · Southwest Airlines
Fleet breakdown
Aircraft types as each source reports them, largest first.
Allegiant Air fleet3 types
Southwest Airlines fleet
The source gives no aircraft-type breakdown.
Baggage & fees compared
Human-reviewed summaries. Rules change, so check the airline's own site before you book.
Allegiant Air
Allegiant's Optional Services & Fees page sets out the following limits. Sizes and weights only; carry-on and checked bags are charged for, and charges vary by route.
- Personal item: one, free of charge, up to 8 x 14 x 18 in (20 x 35 x 45 cm).
- Carry-on bag (paid): one, up to 10 x 16 x 22 in (25 x 40 x 55 cm). No weight limit is stated.
- Checked bags (paid): up to four per passenger, each up to 80 in (203 cm) in combined length, width and height and 50 lb (22 kg). Bags of 51 to 100 lb (23.1 to 45.4 kg) are treated as overweight.
- Measurements include wheels, handles, pockets and decorations.
- Car seats, strollers, mobility aids and assistive devices are not charged as baggage; a car seat or stroller may need to be checked at the gate.
Source: Allegiant Air, "Optional Services & Fees" (baggage section), read on 24 October 2026.
Source: airline baggage page, read 2026-10-24.
Southwest Airlines
Southwest's help centre sets out these limits. Sizes and weights only; since 28 May 2025 checked bags are charged on most fares, so check what your fare includes.
- Carry-on bag: one bag of up to 24 x 16 x 10 inches (length x width x height), including wheels, handles and attachments. It goes in the overhead bin.
- Personal item: one item that fits under the seat in front, such as a purse, briefcase, laptop case or backpack. Southwest gives examples but publishes no dimensions for it. A pet carrier counts as either the carry-on or the personal item.
- Checked bags: standard limit of 62 inches (length + width + height, wheels and handles included) and up to 50 pounds per bag. Bags over these limits attract extra charges.
- Some countries are subject to baggage embargoes that restrict oversized, overweight and extra checked bags, and partner itineraries may follow the partner airline's rules.
Bags too large for the cabin, or a second carry-on or personal item, must be checked at the ticket counter before the gate. Source: Southwest Help Center, "Carryon and Personal Item Policy" and "Checked Bag Policy", read on 24 October 2026.
Source: airline baggage page, read 2026-10-24.
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Frequently asked
Which has the bigger fleet, Allegiant Air or Southwest Airlines?
Southwest Airlines has the larger published fleet. Allegiant Air 124 aircraft (Airline report, as of 30 June 2026); Southwest Airlines 803 aircraft (Airline report, as of 30 September 2026).
Is Allegiant Air cheaper than Southwest Airlines?
Fares change by route, date and demand, so neither airline is always cheaper. This page compares fleets and published facts, not fares. To check prices for a trip, search both airlines for the same dates.
Which airline is older?
Southwest Airlines was founded in 1971, Allegiant Air in 1998.
Do Allegiant Air and Southwest Airlines share a hub airport?
Yes: Harry Reid International Airport (LAS).
Are both airlines currently flying?
Yes. Both are active in our directory.