Miami International in August 2023

69.2%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 August 2023, reporting carriers scheduled 8,505 domestic departures from Miami International (MIA). 69.2% left less than 15 minutes late and 68.1% reached their destination on time; 1.7% were cancelled.

Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so MIA departures were 7.5 points below the national departure figure.

Flights arriving at MIA that month were on time 71.8% of the time (8,509 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 31% and national aviation system 18%.

On time 68.1%
Arrived 15+ minutes late 29.9%
Cancelled 1.7%
Diverted 0.3%

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

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

Measure	Aug 2023	Year earlier	MIA, 12 months to Jul 2026	All reported flights, Aug 2023
Departed on time	69.2%	—	72.9%	76.7%
Arrived on time	68.1%	—	72.3%	76.9%
Cancelled	1.7%	—	1.6%	1.5%
Average departure delay (late minutes only)	26.7 min	—	19.7 min	17.3 min
Scheduled departures a day	284	—	305	20,100
Scheduled departures	8,505	—	111,186	602,987

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AA American Airlines	4,604	54%	65.2%	23.3 min	1.8%
MQ Envoy Air	1,045	12%	76.7%	5.0 min	2.1%
DL Delta Air Lines	840	10%	71.4%	16.2 min	0.7%
NK Spirit Airlines	619	7%	68.3%	20.1 min	1.6%
WN Southwest Airlines	453	5%	73.3%	12.4 min	0.2%
UA United Airlines	403	5%	78.4%	5.9 min	1.2%
F9 Frontier Airlines	286	3%	55.6%	34.0 min	4.2%
B6 JetBlue Airways	184	2%	51.6%	46.3 min	5.4%
YX Republic Airline	40	0%	95.0%	-16.4 min	0.0%
AS Alaska Airlines	31	0%	71.0%	43.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MIA–ATL	Miami to Atlanta	543	65.4%	29.2 min	1.1%
MIA–JFK	Miami to New York	478	65.1%	21.8 min	1.9%
MIA–LGA	Miami to New York	422	66.1%	14.9 min	2.1%
MIA–MCO	Miami to Orlando	370	73.5%	22.7 min	1.9%
MIA–DFW	Miami to Dallas/Fort Worth	358	64.2%	27.4 min	0.8%
MIA–ORD	Miami to Chicago	340	69.7%	15.1 min	1.8%
MIA–BOS	Miami to Boston	329	58.1%	32.9 min	2.7%
MIA–LAX	Miami to Los Angeles	309	67.6%	17.8 min	0.6%
MIA–EWR	Miami to Newark	305	70.8%	10.0 min	2.6%
MIA–IAH	Miami to Houston	286	71.7%	16.8 min	2.1%
MIA–PHL	Miami to Philadelphia	284	62.7%	32.9 min	2.5%
MIA–CLT	Miami to Charlotte	279	59.1%	32.3 min	2.9%

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), August 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2023	Minutes
Air carrier	31.3%	36.7%	68,843
Late-arriving aircraft	41.6%	42.2%	91,412
National Aviation System	18.3%	15.7%	40,249
Extreme weather	8.6%	5.1%	18,932
Security	0.2%	0.2%	549

219,985 delay minutes on 2,546 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 August 2023?

69.2% of 8,505 scheduled domestic departures left less than 15 minutes late, and 68.1% reached their destination on time. The national figures that month were 76.7% and 76.9%.

How does that compare with a year earlier?

August 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 August 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.