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U.S. Department of TransportationU.S. Department of Transportation IconUnited States Department of TransportationUnited States Department of Transportation
BTS> TranStats
Airlines and Airports
Airline On-Time Statistics and Delay Causes
Delay Cause Definition  Understanding Delay Data   Database Tables  Flight Delays at a Glance
Note: The numbers are for the marketing, reporting operating, and codeshare carriers from January 2018.
(Select 6-18 individual months)
Weather's Share of National Aviation System (NAS) Delays
National (August, 2023 - January, 2024)
Most Recent Month      Year to DateView Bar Chart  Print Table  
 AugustSeptemberOctoberNovemberDecemberJanuaryTotal
Weather
Number of Delays16,86715,6226,7575,9178,33519,19772,695
% of Total NAS Delayed Operations54.48%52.44%29.15%26.89%31.57%52.09%42.97%
Delayed Minutes991,7421,030,906317,405244,653422,7421,174,7534,182,201
% of Total NAS Delayed Minutes64.15%66.76%36.67%31.70%40.78%64.57%55.15%
Non-Weather
Number of Delays14,09514,16816,42116,09018,06417,65496,492
% of Total NAS Delayed Operations45.52%47.56%70.85%73.11%68.43%47.91%57.03%
Delayed Minutes554,182513,370548,208527,205613,995644,6263,401,586
% of Total NAS Delayed Minutes35.85%33.24%63.33%68.30%59.22%35.43%44.85%
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.

SOURCE: Federal Aviation Administration OPSNET
More Topics:
Ontime Arrival Performance
Flight Delays by Cause
Weather's Share of Delayed Flights
National Aviation System (NAS) Delay by Cause