Miami International in September 2023

73.2%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 September 2023, reporting carriers scheduled 7,554 domestic departures from Miami International (MIA). 73.2% left less than 15 minutes late and 69.9% reached their destination on time; 1.1% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so MIA departures were 7.3 points below the national departure figure.

Flights arriving at MIA that month were on time 74.8% of the time (7,548 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 32%, air carrier 32% and national aviation system 25%.

On time 69.9%
Arrived 15+ minutes late 28.7%
Cancelled 1.1%
Diverted 0.3%

Every scheduled departure from MIA in September 2023, judged by arrival at the destination.

September 2023 against a year earlier, the airport's year and the nation

Measure	Sep 2023	Year earlier	MIA, 12 months to Jul 2026	All reported flights, Sep 2023
Departed on time	73.2%	—	72.9%	80.5%
Arrived on time	69.9%	—	72.3%	80.1%
Cancelled	1.1%	—	1.6%	1.2%
Average departure delay (late minutes only)	22.0 min	—	19.7 min	14.1 min
Scheduled departures a day	252	—	305	18,978
Scheduled departures	7,554	—	111,186	569,338

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AA American Airlines	4,049	54%	69.6%	17.2 min	0.8%
MQ Envoy Air	893	12%	76.1%	6.6 min	0.6%
DL Delta Air Lines	805	11%	69.1%	21.3 min	1.6%
NK Spirit Airlines	554	7%	69.9%	12.9 min	2.0%
WN Southwest Airlines	443	6%	71.6%	12.5 min	0.2%
UA United Airlines	344	5%	69.5%	11.8 min	3.5%
F9 Frontier Airlines	248	3%	68.5%	18.7 min	2.4%
B6 JetBlue Airways	170	2%	47.6%	46.2 min	4.1%
AS Alaska Airlines	30	0%	80.0%	-2.9 min	0.0%
YX Republic Airline	18	0%	72.2%	-6.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MIA–ATL	Miami to Atlanta	543	70.9%	18.5 min	0.6%
MIA–JFK	Miami to New York	444	64.0%	24.6 min	1.8%
MIA–LGA	Miami to New York	424	71.2%	5.6 min	3.1%
MIA–MCO	Miami to Orlando	357	72.3%	14.8 min	0.6%
MIA–ORD	Miami to Chicago	339	76.1%	6.6 min	0.3%
MIA–DFW	Miami to Dallas/Fort Worth	324	69.1%	18.2 min	0.9%
MIA–EWR	Miami to Newark	324	61.1%	21.1 min	5.9%
MIA–LAX	Miami to Los Angeles	277	63.9%	24.0 min	0.4%
MIA–BOS	Miami to Boston	274	61.3%	23.4 min	1.8%
MIA–CLT	Miami to Charlotte	269	72.5%	20.9 min	0.7%
MIA–PHL	Miami to Philadelphia	261	69.3%	19.9 min	0.4%
MIA–DCA	Miami to Washington	260	73.1%	7.7 min	1.5%

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 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2023	Minutes
Air carrier	31.6%	36.4%	53,602
Late-arriving aircraft	32.4%	38.3%	54,977
National Aviation System	24.9%	19.9%	42,201
Extreme weather	10.7%	5.1%	18,113
Security	0.4%	0.2%	613

169,506 delay minutes on 2,165 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 MIA on time in September 2023?

73.2% of 7,554 scheduled domestic departures left less than 15 minutes late, and 69.9% reached their destination on time. The national figures that month were 80.5% and 80.1%.

How does that compare with a year earlier?

September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for MIA · methodology · corrections.