Louisville Muhammad Ali International in September 2024

86.5%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In September 2024, reporting carriers scheduled 2,025 domestic departures from Louisville Muhammad Ali International (SDF). 86.5% left less than 15 minutes late and 84.5% reached their destination on time; 0.4% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so SDF departures were 2.1 points above the national departure figure.

A year earlier, in September 2023, the airport had 2,039 departures with 85.1% leaving on time: a change of +1.4 points, with flights down 1%.

Flights arriving at SDF that month were on time 84.7% of the time (2,023 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 46%, late-arriving aircraft 30% and national aviation system 19%.

On time 84.5%
Arrived 15+ minutes late 15.0%
Cancelled 0.4%
Diverted 0.1%

Every scheduled departure from SDF in September 2024, judged by arrival at the destination.

September 2024 against a year earlier, the airport's year and the nation

Measure	Sep 2024	Sep 2023	SDF, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	86.5%	85.1%	80.0%	84.4%
Arrived on time	84.5%	83.2%	79.7%	83.9%
Cancelled	0.4%	1.3%	2.2%	0.6%
Average departure delay (late minutes only)	10.8 min	12.1 min	15.9 min	10.6 min
Scheduled departures a day	68	68	63	19,421
Scheduled departures	2,025	2,039	23,144	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	548	27%	91.2%	-3.4 min	0.0%
WN Southwest Airlines	376	19%	84.6%	-0.5 min	0.5%
AA American Airlines	208	10%	67.3%	15.1 min	1.4%
DL Delta Air Lines	207	10%	90.3%	-6.3 min	0.5%
MQ Envoy Air	183	9%	81.4%	2.8 min	0.5%
OO SkyWest Airlines	178	9%	86.0%	0.0 min	0.0%
OH PSA Airlines	140	7%	77.9%	29.7 min	0.7%
NK Spirit Airlines	68	3%	80.9%	-2.0 min	0.0%
UA United Airlines	60	3%	88.3%	6.3 min	1.7%
G4 Allegiant Air	54	3%	85.2%	4.1 min	0.0%
9E Endeavor Air	3	0%	33.3%	12.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SDF–ATL	Louisville to Atlanta	233	91.0%	-6.6 min	0.4%
SDF–DFW	Louisville to Dallas/Fort Worth	184	73.4%	13.0 min	0.0%
SDF–CLT	Louisville to Charlotte	180	69.4%	16.0 min	2.2%
SDF–ORD	Louisville to Chicago	146	84.2%	6.5 min	0.0%
SDF–LGA	Louisville to New York	132	95.5%	-9.1 min	0.0%
SDF–DTW	Louisville to Detroit	111	90.1%	-5.5 min	0.0%
SDF–PHL	Louisville to Philadelphia	93	88.2%	22.7 min	0.0%
SDF–DEN	Louisville to Denver	90	87.8%	4.3 min	1.1%
SDF–DCA	Louisville to Washington	86	88.4%	0.1 min	1.2%
SDF–MDW	Louisville to Chicago	85	89.4%	-3.4 min	0.0%
SDF–MSP	Louisville to Minneapolis	81	80.2%	4.0 min	0.0%
SDF–EWR	Louisville to Newark	78	93.6%	-7.2 min	0.0%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	46.2%	38.6%	9,805
Late-arriving aircraft	30.1%	38.4%	6,378
National Aviation System	18.6%	18.2%	3,937
Extreme weather	5.1%	4.8%	1,086
Security	0.0%	0.1%	0

21,206 delay minutes on 303 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left SDF on time in September 2024?

86.5% of 2,025 scheduled domestic departures left less than 15 minutes late, and 84.5% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 85.1% of 2,039 departures left on time and 1.3% were cancelled, against 86.5% and 0.4% in September 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for SDF · methodology · corrections.