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Phoenix, United States – December 24, 2022: A Frontier Airlines A320 N233FR airplane flying in a blue sky.

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Many airlines increased checked bag fees last year.

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Southwest Airlines introduced baggage fees this year, beginning for travel booked May 28, 2025.

Astudy by CashNetUSArevealed the cheapest and most expensive airlines for domestic flights.

Heres a look at what it found.

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Also seewhy you shouldnt buy airline tickets on this day of the week.

In 2014, Frontier led the way in the (somewhat unwelcome) trend of add-on airline fees.

The Frontier CEO at the time tried to spin it as a positive.

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Alaska Airlines came in a close second, with the cheapest flights from 14 states mainly eastern states.

What other airlines offer cheap domestic flights from many major U.S. cities?

And which ones are the priciest?

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Heres a look at other cheap airlines for domestic economy flights.

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