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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 (September, 2025 - February, 2026)
Most Recent Month      Year to DateView Bar Chart  Print Table  
 SeptemberOctoberNovemberDecemberJanuaryFebruaryTotal
Weather
Number of Delays11,67312,69615,44020,91313,26210,95384,937
% of Total NAS Delayed Operations38.88%30.84%38.26%46.73%41.16%37.00%38.94%
Delayed Minutes672,504750,6971,157,6341,446,001855,798669,0345,551,668
% of Total NAS Delayed Minutes44.54%38.33%47.46%59.29%53.21%48.61%49.00%
Non-Weather
Number of Delays18,34728,46524,91623,83918,95718,650133,174
% of Total NAS Delayed Operations61.12%69.16%61.74%53.27%58.84%63.00%61.06%
Delayed Minutes837,3091,207,7951,281,518992,836752,462707,1855,779,105
% of Total NAS Delayed Minutes55.46%61.67%52.54%40.71%46.79%51.39%51.00%
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.

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