Miami International in December 2023

76.9%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 December 2023, reporting carriers scheduled 9,861 domestic departures from Miami International (MIA). 76.9% left less than 15 minutes late and 75.9% reached their destination on time; 0.1% were cancelled.

Nationally that month, 83.1% of flights departed on time and 83.8% arrived on time, so MIA departures were 6.2 points below the national departure figure.

Flights arriving at MIA that month were on time 75.8% of the time (9,880 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, air carrier 39% and national aviation system 19%.

On time 75.9%
Arrived 15+ minutes late 23.8%
Cancelled 0.1%
Diverted 0.2%

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

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

Measure	Dec 2023	Year earlier	MIA, 12 months to Jul 2026	All reported flights, Dec 2023
Departed on time	76.9%	—	72.9%	83.1%
Arrived on time	75.9%	—	72.3%	83.8%
Cancelled	0.1%	—	1.6%	0.4%
Average departure delay (late minutes only)	15.7 min	—	19.7 min	11.6 min
Scheduled departures a day	329	—	305	19,013
Scheduled departures	9,861	—	111,186	570,394

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AA American Airlines	4,867	49%	74.5%	9.8 min	0.0%
MQ Envoy Air	1,318	13%	77.9%	4.0 min	0.0%
DL Delta Air Lines	999	10%	77.6%	5.1 min	0.0%
NK Spirit Airlines	695	7%	77.3%	4.6 min	0.4%
UA United Airlines	638	6%	81.5%	2.6 min	0.0%
WN Southwest Airlines	578	6%	74.7%	8.5 min	0.5%
F9 Frontier Airlines	322	3%	80.1%	2.8 min	0.3%
B6 JetBlue Airways	259	3%	64.5%	34.0 min	0.8%
YX Republic Airline	107	1%	77.6%	10.8 min	0.0%
AS Alaska Airlines	62	1%	82.3%	-10.9 min	1.6%
9E Endeavor Air	16	0%	68.8%	21.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MIA–ATL	Miami to Atlanta	657	76.4%	9.2 min	0.0%
MIA–LGA	Miami to New York	515	77.3%	4.1 min	0.0%
MIA–JFK	Miami to New York	463	75.8%	9.8 min	0.2%
MIA–EWR	Miami to Newark	455	80.4%	5.6 min	0.0%
MIA–ORD	Miami to Chicago	436	81.7%	-1.5 min	0.0%
MIA–DFW	Miami to Dallas/Fort Worth	428	73.4%	10.3 min	0.0%
MIA–BOS	Miami to Boston	353	70.5%	15.1 min	0.6%
MIA–DCA	Miami to Washington	321	83.5%	0.5 min	0.0%
MIA–LAX	Miami to Los Angeles	313	76.4%	9.5 min	0.0%
MIA–MCO	Miami to Orlando	311	76.5%	8.1 min	0.0%
MIA–CLT	Miami to Charlotte	280	81.8%	3.6 min	0.0%
MIA–IAH	Miami to Houston	268	72.0%	13.7 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), December 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2023	Minutes
Air carrier	39.4%	37.1%	56,586
Late-arriving aircraft	39.6%	38.8%	56,751
National Aviation System	18.5%	17.6%	26,534
Extreme weather	2.2%	6.2%	3,152
Security	0.3%	0.3%	458

143,481 delay minutes on 2,345 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 December 2023?

76.9% of 9,861 scheduled domestic departures left less than 15 minutes late, and 75.9% reached their destination on time. The national figures that month were 83.1% and 83.8%.

How does that compare with a year earlier?

December 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 December 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.