r/lists • Posted by Clara "CJ" Johnson✈️ Travel

Airlines to Avoid: US Carriers with the Most Passenger Complaints and Delays (2024-2025)

Airlines to Avoid: US Carriers with the Most Passenger Complaints and Delays (2024-2025)Hey fellow travelers! As someone who spends a lot of time flying, I'm always keeping an eye on which airlines are doing right by their passengers and which ones... well, aren't. Based on recent data from 2024 and extending into 2025, here are some US carriers that have seen a high number of complaints and significant delays. You might want to think twice before booking your next trip with them!
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  1. 1

    Frontier Airlines

    flyfrontier.com
    Oh, Frontier! This airline consistently tops the charts for passenger complaints, showing more than double the complaints per 100,000 passengers compared to the next worst carrier in 2024. They also had the highest rates of flight delays and cancellations, making them a real gamble.
  2. 2

    Spirit Airlines

    spirit.com
    Spirit often comes in second for the most passenger complaints and is a frequent flyer on lists for delays and cancellations. While their low fares can be tempting, prepare for potential headaches and frustrating customer service if things go wrong.
  3. 3

    JetBlue Airways

    jetblue.com
    Unfortunately, JetBlue has been slipping in recent years, landing in the top three for passenger complaints in 2024. They've also shown a high percentage of delayed flights, which can really throw a wrench in your travel plans.
  4. 4

    American Airlines

    aa.com
    It's tough to see a major carrier struggle, but American Airlines has ranked poorly for delays, cancellations, and even mishandled bags. In 2025, they were among the worst performers for delays and cancellations, which is definitely something to consider for reliability.
  5. 5

    United Airlines

    united.com
    While a legacy carrier, United still features on lists for higher complaints among major airlines and has a notable cancellation rate. Their mishandled baggage rate has also been a concern, which is never fun.
  6. 6

    Allegiant Air

    allegiantair.com
    Allegiant is known for its ultra-low fares, but those come with a trade-off. Passengers frequently report long delays, last-minute cancellations, and a general struggle with customer service when issues arise.

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