In the fourth and final segment of 2018's best and worst airlines and airports, presented here are the year's 10 worst airports, as ranked by the data researchers at AirHelp. This is the sixth consecutive year of this study. In this year's analysis of the world's terminals, AirHelp ranked 141 international airports on three key factors, heavily favoring the first two:

• On-time performance.
• Quality of service.
• Online consumer sentiment.

This data is important for flyers, whether they're traveling on business or vacation, as unexpected delays, long security lines or other travel nightmares can have costly impacts on any travel itinerary. View the slideshow above to see the 10 worst airports to fly in or out of this year. Related: 10 worst airlines of 2018