1. JetBlue Airways
JetBlue has become a popular choice for budget travelers in the United States, with a cost per mile of $0.402.
2. Southwest Airline
Southwest Airlines has had a long reign with frequent flyers. They have free checked bags, carry-on, snacks, and a generous seat pitch for a budget airline.
3. Spirit Airlines
With various no-frills options like the “Bare Fare” that allows a single personal item on board, you get all you need without any added frills.
4. Allegiant Air
Allegiant Air is a low-cost airline based in Las Vegas, Nevada. The airline operates scheduled and charter flights to over 120 destinations across the United States.
5. Frontier Airlines
Frontier Airlines is a low-cost airline based in Denver, Colorado, that offers flights to over 100 destinations in the United States, Mexico, and the Caribbean.