Louis Armstrong New Orleans International in September 2025

86.1%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 September 2025, reporting carriers scheduled 3,619 domestic departures from Louis Armstrong New Orleans International (MSY). 86.1% left less than 15 minutes late and 85.4% reached their destination on time; 0.4% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so MSY departures were 3.0 points above the national departure figure.

A year earlier, in September 2024, the airport had 3,659 departures with 81.0% leaving on time: a change of +5.1 points, with flights down 1%.

Flights arriving at MSY that month were on time 85.2% of the time (3,619 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, air carrier 31% and national aviation system 28%.

On time 85.4%
Arrived 15+ minutes late 14.0%
Cancelled 0.4%
Diverted 0.2%

Every scheduled departure from MSY in September 2025, judged by arrival at the destination.

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

Measure	Sep 2025	Sep 2024	MSY, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	86.1%	81.0%	76.0%	83.1%
Arrived on time	85.4%	81.4%	76.9%	82.8%
Cancelled	0.4%	3.6%	1.5%	0.5%
Average departure delay (late minutes only)	10.9 min	10.2 min	17.3 min	12.2 min
Scheduled departures a day	121	122	135	18,748
Scheduled departures	3,619	3,659	49,152	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	1,292	36%	86.1%	0.3 min	0.1%
DL Delta Air Lines	567	16%	90.1%	-3.1 min	0.2%
UA United Airlines	529	15%	90.5%	-8.2 min	0.4%
AA American Airlines	407	11%	79.6%	10.0 min	1.0%
NK Spirit Airlines	382	11%	82.5%	1.4 min	0.5%
MQ Envoy Air	116	3%	80.2%	1.0 min	1.7%
YX Republic Airline	71	2%	85.9%	-4.5 min	0.0%
OH PSA Airlines	67	2%	80.6%	16.3 min	0.0%
OO SkyWest Airlines	60	2%	90.0%	-7.1 min	0.0%
B6 JetBlue Airways	52	1%	57.7%	19.2 min	0.0%
AS Alaska Airlines	47	1%	76.6%	4.0 min	2.1%
F9 Frontier Airlines	29	1%	65.5%	22.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MSY–ATL	New Orleans to Atlanta	304	94.1%	-7.5 min	0.0%
MSY–IAH	New Orleans to Houston	280	90.4%	-13.0 min	0.7%
MSY–DFW	New Orleans to Dallas/Fort Worth	234	76.1%	16.1 min	2.1%
MSY–DAL	New Orleans to Dallas	179	88.3%	-0.2 min	0.6%
MSY–AUS	New Orleans to Austin	177	88.7%	-2.3 min	0.0%
MSY–HOU	New Orleans to Houston	176	85.8%	-1.1 min	0.0%
MSY–DEN	New Orleans to Denver	155	81.9%	2.7 min	0.0%
MSY–DCA	New Orleans to Washington	142	72.5%	14.4 min	0.0%
MSY–MCO	New Orleans to Orlando	142	88.7%	-3.6 min	0.0%
MSY–ORD	New Orleans to Chicago	142	92.3%	-4.3 min	0.7%
MSY–LAX	New Orleans to Los Angeles	121	86.0%	6.8 min	0.0%
MSY–BNA	New Orleans to Nashville	120	95.0%	-5.1 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	30.8%	34.3%	10,857
Late-arriving aircraft	37.7%	37.4%	13,294
National Aviation System	28.3%	22.6%	10,000
Extreme weather	3.2%	5.6%	1,116
Security	0.1%	0.1%	24

35,291 delay minutes on 508 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 MSY on time in September 2025?

86.1% of 3,619 scheduled domestic departures left less than 15 minutes late, and 85.4% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 81.0% of 3,659 departures left on time and 3.6% were cancelled, against 86.1% and 0.4% in September 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for MSY · methodology · corrections.