Headquarters: Las Vegas, Nevada
On-time performance for arrivals: 57.9%
No. of flights: 10,408
Percentage of cancelations: 5.7%
Originally operating as WestJet Express, this airline changed its name to avoid being confused with the Canadian low-cost carrier about to appear in the top 10 worst on this list. (Good call!) Also a budget carrier, Allegiant flies to secondary destinations such as Flint, Michigan, instead of Detroit, and Allentown, Pennsylvania, instead of Philadelphia. That doesn’t mean it’s always on time, but at least the crowds are smaller.