Louisville Muhammad Ali International in January 2025

78.2%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 January 2025, reporting carriers scheduled 1,701 domestic departures from Louisville Muhammad Ali International (SDF). 78.2% left less than 15 minutes late and 72.0% reached their destination on time; 6.3% were cancelled.

Nationally that month, 79.3% of flights departed on time and 78.6% arrived on time, so SDF departures were 1.1 points below the national departure figure.

A year earlier, in January 2024, the airport had 1,755 departures with 78.7% leaving on time: a change of −0.5 points, with flights down 3%.

Flights arriving at SDF that month were on time 76.7% of the time (1,702 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 42%, late-arriving aircraft 30% and national aviation system 21%.

On time 72.0%
Arrived 15+ minutes late 21.3%
Cancelled 6.3%
Diverted 0.4%

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

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

Measure	Jan 2025	Jan 2024	SDF, 12 months to Jul 2026	All reported flights, Jan 2025
Departed on time	78.2%	78.7%	80.0%	79.3%
Arrived on time	72.0%	74.8%	79.7%	78.6%
Cancelled	6.3%	2.1%	2.2%	3.0%
Average departure delay (late minutes only)	20.3 min	19.5 min	15.9 min	14.0 min
Scheduled departures a day	57	59	63	17,992
Scheduled departures	1,701	1,755	23,144	539,747

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	500	29%	76.6%	-1.1 min	5.2%
WN Southwest Airlines	378	22%	80.2%	1.3 min	4.2%
AA American Airlines	210	12%	64.3%	44.3 min	4.8%
DL Delta Air Lines	180	11%	72.8%	13.0 min	5.6%
OH PSA Airlines	143	8%	60.1%	24.6 min	13.3%
OO SkyWest Airlines	129	8%	65.9%	13.9 min	7.0%
UA United Airlines	51	3%	60.8%	15.5 min	3.9%
G4 Allegiant Air	49	3%	71.4%	52.5 min	8.2%
MQ Envoy Air	36	2%	58.3%	68.0 min	25.0%
NK Spirit Airlines	25	1%	60.0%	15.7 min	8.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SDF–ATL	Louisville to Atlanta	210	74.3%	10.8 min	5.7%
SDF–ORD	Louisville to Chicago	158	65.8%	10.0 min	6.3%
SDF–CLT	Louisville to Charlotte	154	66.2%	58.7 min	7.8%
SDF–DFW	Louisville to Dallas/Fort Worth	152	59.9%	26.1 min	12.5%
SDF–LGA	Louisville to New York	128	71.9%	5.0 min	3.9%
SDF–DTW	Louisville to Detroit	88	79.5%	-5.2 min	4.5%
SDF–EWR	Louisville to Newark	85	80.0%	-6.6 min	5.9%
SDF–DCA	Louisville to Washington	82	64.6%	13.9 min	11.0%
SDF–DEN	Louisville to Denver	82	62.2%	15.5 min	3.7%
SDF–MDW	Louisville to Chicago	64	79.7%	2.4 min	3.1%
SDF–BWI	Louisville to Baltimore	63	79.4%	-2.1 min	7.9%
SDF–MCO	Louisville to Orlando	59	88.1%	-2.3 min	3.4%

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), January 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2025	Minutes
Air carrier	42.2%	36.2%	14,968
Late-arriving aircraft	29.5%	34.7%	10,464
National Aviation System	20.8%	19.9%	7,397
Extreme weather	7.5%	9.1%	2,669
Security	0.0%	0.2%	5

35,503 delay minutes on 363 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 January 2025?

78.2% of 1,701 scheduled domestic departures left less than 15 minutes late, and 72.0% reached their destination on time. The national figures that month were 79.3% and 78.6%.

How does that compare with a year earlier?

In January 2024, 78.7% of 1,755 departures left on time and 2.1% were cancelled, against 78.2% and 6.3% in January 2025.

Provenance

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