Colombia's low-cost airline received an overall airline index of 3.4 out of 10 and was labeled the world's worst airline. According to Bounce, it carries 22.55 million passengers per year and operates 40,000 flights per year. It had one of the fewest complaints, but it received a one-star rating (out of five) for staff service, meals, seat comfort, and entertainment.
VivaAerobus, another low-cost airline, is a 14-year-old Mexican company. According to the ratings, the deal-breakers were meals, seat comfort, and in-flight entertainment—all of which received a 1, while staff service received a 2. Passengers onboard must pay for food and beverages, which cannot be a good thing.
A budget-friendly Mexican airline is also the third-worst airline in the entire world. It only allows 10kg of baggage at most and received 379 complaints between January and June of 2021. This ultra-low-cost carrier's overall airline index is a 4 out of 10.
The Irish low-cost airline Ryanair is slightly better off at 4.2, but it is still the fourth-worst airline in the world. Ryanair does not provide in-flight entertainment, which is by far their worst transgression, and there is no free baggage allowance.
Mexican airline Interjet is also in the top 10, with more complaints than Volaris but better ratings for meals and seat comfort. The airline, which is heavily in debt, hasn't run any flights since December 2020, but it intends to resume them in 2022 with 10 Airbus 320.
Spanish budget carrier Due to poor in-flight entertainment, Vueling received a final score of 5 out of 10. It's interesting to note that in a different analysis of airlines based on punctuality, the European carrier took third place.
Similar to Ryanair, EasyJet is criticised for not offering free baggage allowance. With the exception of in-flight entertainment, the UK-based airline received few complaints and performed well across the board, but the decision to charge for luggage check-in has hurt the carrier's reputation.
An overall rating of 5.3 was given to Ukraine's flagship carrier. Staff service receives a 3, while in-flight entertainment receives a 1. In the six months, there were only 33 complaints.
TAP Air Portugal, Portugal's flagship state-owned airline, has received 1,530 complaints in total. The average category scores of threes and twos would have kept it out of the bottom 10, had it not been struck down (hard) by customer woes.
The Brazilian low-cost carrier received good scores on staff service and seat comfort with just 16 complaints, which is among the fewest (3 out of 5 each). Due to the absence of in-flight entertainment, which earned it a score of 1 out of 5, it entered the top 10 list of the worst airlines in the world.