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Most delayed airlines at Boston Logan International Airport (BOS)

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Jaromir Chalabala // Shutterstock

Most delayed airlines at Boston Logan International Airport (BOS)

Winter weather is one of the most reliable heralds of flight delays. And Avery, the first winter storm of 2018, was no exception. The storm contributed to 2,558 cancellations and 8,215 flight delays on its first day, with lingering effects on subsequent days. Weather is one cause of flight delays categorized by the U.S. Department of Transportation's Bureau of Transportation Statistics. It's part of a broader set of conditions known as the National Aviation System which also includes airport operations, heavy traffic volume, and air traffic control. Extreme weather is in its own category; it covers real and forecasted blizzards, tornadoes, and hurricanes.

Delays also are caused by aircraft carriers and include problems with maintenance and crews, baggage loading, fueling, and aircraft cleaning. Security and safety issues that many people complain about—waiting in security lines for more than 29 minutes, broken equipment, and evacuation of aircraft—are others. Late-arriving aircraft scheduled for a trip later is the last type of delay the government tracks.

Some flights have more problems than others, and Stacker analyzed data from the Bureau of Transportation Statistics to determine which flights out of your city’s airport have the worst records. We ranked airlines by overall on-time performance for all arriving flights in August 2018. We also included the total number of the airlines’ flights out of the airport and their overall on-time percentage.

Flying out of Boston Logan International Airport sometime soon? Take a look at our list to see if it’s likely that your trip will go as scheduled or that you’ll spend more time in the terminal than you had planned before heading to your destination.

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Sla2931 // Wikimedia Commons

#13. Envoy Air

Total flights (August 2018): 226
On-time performance: 83.2%
Air carrier delay: 2.0%
Weather delay: 0.3%
National Aviation System delay: 7.7%
Security delay: 0.0%
Aircraft arriving late delay: 6.9%

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Hawkeye UK // flickr

#12. Republic Airline

Total flights (August 2018): 490
On-time performance: 79.6%
Air carrier delay: 5.4%
Weather delay: 0.5%
National Aviation System delay: 10.5%
Security delay: 0.0%
Aircraft arriving late delay: 4.0%

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Eric Salard // Wikimedia Commons

#11. ExpressJet Airlines Inc.

Total flights (August 2018): 92
On-time performance: 76.1%
Air carrier delay: 1.7%
Weather delay: 0.0%
National Aviation System delay: 14.8%
Security delay: 0.0%
Aircraft arriving late delay: 7.4%

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airlines470 // flickr

#10. Endeavor Air Inc.

Total flights (August 2018): 433
On-time performance: 74.8%
Air carrier delay: 5.1%
Weather delay: 0.2%
National Aviation System delay: 9.5%
Security delay: 0.2%
Aircraft arriving late delay: 10.1%

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Ken Lund // flickr

#9. Southwest Airlines Co.

Total flights (August 2018): 1,139
On-time performance: 73.4%
Air carrier delay: 7.3%
Weather delay: 0.8%
National Aviation System delay: 10.7%
Security delay: 0.0%
Aircraft arriving late delay: 7.7%

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airlines470 // flickr

#8. Delta Air Lines Inc.

Total flights (August 2018): 1,591
On-time performance: 71.7%
Air carrier delay: 5.5%
Weather delay: 1.1%
National Aviation System delay: 15.7%
Security delay: 0.0%
Aircraft arriving late delay: 6.1%

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Eric Salard // Wikimedia Commons

#7. American Airlines Inc.

Total flights (August 2018): 2,546
On-time performance: 71.2%
Air carrier delay: 6.7%
Weather delay: 1.6%
National Aviation System delay: 12.6%
Security delay: 0.0%
Aircraft arriving late delay: 7.8%

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Prayitno / Thank you for (12 millions +) view // flickr

#6. Spirit Air Lines

Total flights (August 2018): 483
On-time performance: 70.8%
Air carrier delay: 3.6%
Weather delay: 1.7%
National Aviation System delay: 16.9%
Security delay: 0.1%
Aircraft arriving late delay: 6.9%

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Cory W. Watts // Wikimedia Commons

#5. JetBlue Airways

Total flights (August 2018): 4,498
On-time performance: 68.4%
Air carrier delay: 6.6%
Weather delay: 0.7%
National Aviation System delay: 12.7%
Security delay: 0.0%
Aircraft arriving late delay: 11.7%

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Cubbie_n_Vegas// Wikimedia Commons

#4. Alaska Airlines Inc.

Total flights (August 2018): 353
On-time performance: 65.4%
Air carrier delay: 5.3%
Weather delay: 0.0%
National Aviation System delay: 24.7%
Security delay: 0.0%
Aircraft arriving late delay: 4.6%

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TDelCoro // flickr

#3. United Air Lines Inc.

Total flights (August 2018): 1,353
On-time performance: 63.8%
Air carrier delay: 6.6%
Weather delay: 1.0%
National Aviation System delay: 16.1%
Security delay: 0.0%
Aircraft arriving late delay: 12.5%

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Cliff // flickr

#2. SkyWest Airlines Inc.

Total flights (August 2018): 298
On-time performance: 57.0%
Air carrier delay: 6.7%
Weather delay: 7.2%
National Aviation System delay: 9.3%
Security delay: 0.3%
Aircraft arriving late delay: 19.4%

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redlegsfan21 // flickr

#1. Mesa Airlines Inc.

Total flights (August 2018): 6
On-time performance: 50.0%
Air carrier delay: 16.7%
Weather delay: 0.0%
National Aviation System delay: 33.3%
Security delay: 0.0%
Aircraft arriving late delay: 0.0%

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