Louisville Muhammad Ali International in April 2026

83.1%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 April 2026, reporting carriers scheduled 2,136 domestic departures from Louisville Muhammad Ali International (SDF). 83.1% left less than 15 minutes late and 80.9% reached their destination on time; 1.1% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so SDF departures were 4.0 points above the national departure figure.

A year earlier, in April 2025, the airport had 1,948 departures with 81.6% leaving on time: a change of +1.5 points, with flights up 10%.

Flights arriving at SDF that month were on time 79.6% of the time (2,141 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 32% and national aviation system 21%.

On time 80.9%
Arrived 15+ minutes late 17.9%
Cancelled 1.1%
Diverted 0.1%

Every scheduled departure from SDF in April 2026, judged by arrival at the destination.

April 2026 against a year earlier, the airport's year and the nation

Measure	Apr 2026	Apr 2025	SDF, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	83.1%	81.6%	80.0%	79.1%
Arrived on time	80.9%	80.6%	79.7%	78.9%
Cancelled	1.1%	1.4%	2.2%	0.9%
Average departure delay (late minutes only)	14.7 min	14.0 min	15.9 min	14.5 min
Scheduled departures a day	71	65	63	19,931
Scheduled departures	2,136	1,948	23,144	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	497	23%	83.9%	-3.9 min	2.0%
WN Southwest Airlines	475	22%	81.5%	2.4 min	0.2%
OO SkyWest Airlines	271	13%	76.8%	16.1 min	1.5%
AA American Airlines	255	12%	80.0%	10.0 min	0.4%
DL Delta Air Lines	244	11%	91.0%	-11.2 min	1.6%
OH PSA Airlines	168	8%	75.6%	19.3 min	1.2%
MQ Envoy Air	82	4%	74.4%	10.9 min	0.0%
UA United Airlines	68	3%	82.4%	1.9 min	1.5%
G4 Allegiant Air	55	3%	60.0%	19.8 min	0.0%
NK Spirit Airlines	21	1%	61.9%	14.0 min	4.8%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SDF–ORD	Louisville to Chicago	311	73.3%	11.4 min	3.9%
SDF–ATL	Louisville to Atlanta	240	92.1%	-11.9 min	1.7%
SDF–DFW	Louisville to Dallas/Fort Worth	178	70.8%	30.1 min	1.1%
SDF–CLT	Louisville to Charlotte	153	86.3%	-5.5 min	0.0%
SDF–DTW	Louisville to Detroit	116	84.5%	11.9 min	0.9%
SDF–MSP	Louisville to Minneapolis	94	81.9%	4.6 min	0.0%
SDF–DEN	Louisville to Denver	92	87.0%	-2.0 min	1.1%
SDF–DCA	Louisville to Washington	90	85.6%	5.7 min	1.1%
SDF–LGA	Louisville to New York	87	82.8%	-6.4 min	1.1%
SDF–MDW	Louisville to Chicago	87	79.3%	2.2 min	1.1%
SDF–EWR	Louisville to Newark	83	94.0%	-10.3 min	0.0%
SDF–BWI	Louisville to Baltimore	74	83.8%	-3.0 min	0.0%

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), April 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2026	Minutes
Air carrier	43.6%	33.5%	13,795
Late-arriving aircraft	31.6%	40.4%	10,000
National Aviation System	21.1%	21.0%	6,666
Extreme weather	3.8%	5.0%	1,196
Security	0.0%	0.1%	7

31,664 delay minutes on 382 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 April 2026?

83.1% of 2,136 scheduled domestic departures left less than 15 minutes late, and 80.9% reached their destination on time. The national figures that month were 79.1% and 78.9%.

How does that compare with a year earlier?

In April 2025, 81.6% of 1,948 departures left on time and 1.4% were cancelled, against 83.1% and 1.1% in April 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for April 2026; 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.