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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, 2022 - January, 2023)
Most Recent Month      Year to DateView Bar Chart  Print Table  
 AugustSeptemberOctoberNovemberDecemberJanuaryTotal
Weather
Number of Delays17,51911,55211,34413,39116,30716,17486,287
% of Total NAS Delayed Operations58.06%49.15%48.23%45.84%47.12%44.34%48.61%
Delayed Minutes1,104,792576,458604,822681,167890,466861,7234,719,428
% of Total NAS Delayed Minutes67.99%56.79%60.33%56.85%56.15%47.23%57.20%
Non-Weather
Number of Delays12,65311,95312,17515,82018,30420,30691,211
% of Total NAS Delayed Operations41.94%50.85%51.77%54.16%52.88%55.66%51.39%
Delayed Minutes520,073438,671397,732516,911695,529962,9233,531,839
% of Total NAS Delayed Minutes32.01%43.21%39.67%43.15%43.85%52.77%42.80%
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