Spirit Airlines has the highest hidden fees of any US carrier - making trips 736 percent more expensive than their base airfare, a new study has revealed. The budget airline adds an average of $161.12 on top of a fare of just $21.89, according to analysis by discount code website , the highest increase of any airline in the world.Volaris, a Mexican low-cost airline, has the second highest hidden fees, according to the study. The hidden costs are 626 percent of the original airfare, asking customers to pay $82.20 on top of a $13.13 flight.
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