Louisville Muhammad Ali International in July 2025

75.1%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 July 2025, reporting carriers scheduled 2,176 domestic departures from Louisville Muhammad Ali International (SDF). 75.1% left less than 15 minutes late and 76.1% reached their destination on time; 2.6% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so SDF departures were 5.4 points above the national departure figure.

A year earlier, in July 2024, the airport had 2,183 departures with 73.1% leaving on time: a change of +2.0 points, with flights down 0%.

Flights arriving at SDF that month were on time 67.0% of the time (2,174 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 39%, air carrier 32% and national aviation system 23%.

On time 76.1%
Arrived 15+ minutes late 21.0%
Cancelled 2.6%
Diverted 0.3%

Every scheduled departure from SDF in July 2025, judged by arrival at the destination.

July 2025 against a year earlier, the airport's year and the nation

Measure	Jul 2025	Jul 2024	SDF, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	75.1%	73.1%	80.0%	69.7%
Arrived on time	76.1%	72.0%	79.7%	69.0%
Cancelled	2.6%	2.7%	2.2%	2.5%
Average departure delay (late minutes only)	20.4 min	24.0 min	15.9 min	24.3 min
Scheduled departures a day	73	73	63	21,048
Scheduled departures	2,176	2,183	23,144	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	462	21%	82.0%	3.5 min	2.4%
WN Southwest Airlines	448	21%	75.4%	10.2 min	2.2%
OO SkyWest Airlines	260	12%	69.2%	14.3 min	3.8%
OH PSA Airlines	230	11%	62.2%	29.6 min	6.5%
DL Delta Air Lines	228	10%	85.5%	-6.0 min	0.4%
AA American Airlines	150	7%	78.0%	14.3 min	2.7%
MQ Envoy Air	141	6%	70.2%	10.4 min	2.1%
NK Spirit Airlines	106	5%	78.3%	10.3 min	1.9%
G4 Allegiant Air	88	4%	79.5%	21.3 min	0.0%
UA United Airlines	63	3%	82.5%	-4.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SDF–ORD	Louisville to Chicago	259	69.1%	15.0 min	2.7%
SDF–ATL	Louisville to Atlanta	230	85.2%	-5.8 min	0.4%
SDF–DFW	Louisville to Dallas/Fort Worth	191	69.6%	18.2 min	2.1%
SDF–CLT	Louisville to Charlotte	142	72.5%	23.2 min	2.1%
SDF–DTW	Louisville to Detroit	124	76.6%	7.6 min	0.0%
SDF–LGA	Louisville to New York	115	75.7%	5.8 min	8.7%
SDF–MDW	Louisville to Chicago	104	74.0%	11.2 min	4.8%
SDF–DEN	Louisville to Denver	97	81.4%	0.3 min	0.0%
SDF–DCA	Louisville to Washington	88	65.9%	17.4 min	12.5%
SDF–BWI	Louisville to Baltimore	81	67.9%	21.7 min	6.2%
SDF–MCO	Louisville to Orlando	80	76.3%	6.6 min	0.0%
SDF–EWR	Louisville to Newark	73	74.0%	7.0 min	6.8%

By scheduled departure hour

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

Share of departures that left less than 15 minutes late, by scheduled hour (local time), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	31.9%	31.1%	12,866
Late-arriving aircraft	38.9%	40.8%	15,684
National Aviation System	23.0%	20.7%	9,277
Extreme weather	6.1%	7.3%	2,450
Security	0.0%	0.1%	4

40,281 delay minutes on 457 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 July 2025?

75.1% of 2,176 scheduled domestic departures left less than 15 minutes late, and 76.1% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 73.1% of 2,183 departures left on time and 2.7% were cancelled, against 75.1% and 2.6% in July 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for July 2025; 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.