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United States Department of Transportation

Airlines and Airports
Airline On-Time Statistics and Delay Causes
Delay Cause Definition Understanding Delay Data Database Tables Flight Delays at a Glance

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On-Time Arrival Performance National (September, 2023)
	Most Recent Month Year to Date	View Pie Chart Print Table Download Raw Data

	Number of Operations	% of Total Operations	Delayed Minutes	% of Total Delayed Minutes
On Time	485,287	80.25%	N/A	N/A
Air Carrier Delay	37,189	6.15%	2,831,697	36.19%
Weather Delay	3,815	0.63%	410,867	5.25%
National Aviation System Delay	29,790	4.93%	1,544,276	19.73%
Security Delay	335	0.06%	14,883	0.19%
Aircraft Arriving Late	39,327	6.50%	3,023,566	38.64%
Cancelled	7,492	1.24%	N/A	N/A
Diverted	1,479	0.24%	N/A	N/A
Total Operations	604,715	100.00%	7,825,289	100.00%

A flight is considered delayed when it arrived 15 or more minutes than the schedule (see definitions in Frequently Asked Questions). Delayed minutes are calculated for delayed flights only.
When multiple causes are assigned to one delayed flight, each cause is prorated based on delayed minutes it is responsible for. The displayed numbers are rounded and may not add up to the total.

SOURCE: Bureau of Transportation Statistics, Airline Service Quality Performance 234

More Topics:

Flight Delays by Cause

Weather's Share of Delayed Flights

Weather's Share of National Aviation System (NAS) Delays

National Aviation System (NAS) Delay by Cause