The 10 major US airlines were ranked by how many delays they had in 2019 by US Department of Transportation - see the full list

Ultra-low-cost carrier Frontier Airlines ranked last on the on-time list for 2019, with an average on-time percentage of 73.1. The carrier operates a mixed hub-and-spoke and point-to-point route network, with the former centered around Frontier's main hub in Denver, Colorado. Although 2019 saw JetBlue take delivery of a new aircraft type and announce a historic expansion to Europe for 2021, its on-time percentage for the year was the second-lowest out of the top ten major carriers. The New York-based low-cost carrier only averaged 73.5% on-time arrivals for the year.The nation's third-largest carrier failed to surpass any of its legacy carrier competitors in terms of on-time arrivals, earning a percentage of 75.2 for 2019. The carrier, however, just enacted a new program called connection saver that would hold flights for connecting passengers if the flights were in jeopardy of leaving without them, potentially delaying flights. United was one of the carriers affected by the grounding of the Boeing 737 Max as the carrier operated the Max 9 variant.American Airlines narrowly beat its competitor United by 2.2 percentage points earning an on-time arrival average of 77.4%. American has historically struggled with flight delays during the peak summer season. The world's largest airline also faced a dispute with aircraft mechanics and was affected by the grounding of the Boeing 737 Max. Allegiant Air managed to do better than its ultra-low-cost competitor Frontier Airlines, earning an on-time arrival rate of 78.7% for the year. The Las Vegas-based carrier recently retired its fleet of aging aircraft including the McDonnell Douglas MD-80 series of aircraft and Boeing 757-200 in favor of a newer all-Airbus fleet.Spirit Airlines ranked the highest out of any low-cost carrier in the US, coming in with a 79.5% on-time arrival rate and fourth overall for the year. The carrier as been endeavoring to become more reliable since 2016, according to Skift, and was the most on-time carrier in the US for a brief period in October 2018. Spirit, however, failed to beat its 2018 percentage of 81.1%, according to data from the Department of Transportation.Southwest Airlines earned the title of the highest-ranking low-cost carrier on this list with an on-time arrival percentage of 80.2%. The Dallas-based carrier prides itself on quick turnaround times for its flights, often giving as little as 20 minutes from gate arrival to pushback. The airline is among those affected by the Boeing 737 Max groundings that have also affected American Airlines and United Airlines in the US. Though failing to match its 2018 numbers, Alaska Airlines once again placed third on the list with an on-time arrival rate of 81.3%. The predominantly West Coast airline recently completed a merger with Virgin America that saw it operate new routes and adopt a new subset of Airbus aircraft.The world's second-largest airline ranked again as the US' second-most on-time airline, scoring 83.5% for on-time arrivals. Delta Air Lines increased its on-time arrival rate by .3 percentage points from 2018 and took delivery of two new aircraft types in 2019 including the Airbus A220 and A330-900neo. Delta is one of the three legacy carriers that do not operate any Boeing 737 Max aircraft, allowing it to remain largely unscathed by the 2019 grounding that affected United and American.Hawaiian Airlines once again earned the top spot on the list with the highest on-time arrival percentage. The Honolulu-based carrier beat out Delta by 4.2 percentage points scoring 87.7%. Though the ranking is the closest to 90% than any other carrier, Hawaiian failed to meet or beat its percentage from 2018 by .1 percentage points. Hawaiian expanded its route network in 2019 with its new longest route between Honolulu and Boston.

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The 10 major US airlines were ranked by how many delays they had in 2019 by US Department of Transportation - see the full list

10. Frontier Airlines

9. JetBlue Airways

8. United Airlines

7. American Airlines

6. Allegiant Air

5. Spirit Airlines

4. Southwest Airlines

3. Alaska Airlines

2. Delta Air Lines

1. Hawaiian Airlines