Miami International in December 2024

73.6%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 2024, reporting carriers scheduled 9,937 domestic departures from Miami International (MIA). 73.6% left less than 15 minutes late and 73.7% reached their destination on time; 0.5% were cancelled.

Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so MIA departures were 4.2 points below the national departure figure.

A year earlier, in December 2023, the airport had 9,861 departures with 76.9% leaving on time: a change of −3.3 points, with flights up 1%.

Flights arriving at MIA that month were on time 75.3% of the time (9,957 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 37% and national aviation system 19%.

On time 73.7%
Arrived 15+ minutes late 25.5%
Cancelled 0.5%
Diverted 0.3%

Every scheduled departure from MIA in December 2024, judged by arrival at the destination.

December 2024 against a year earlier, the airport's year and the nation

Measure	Dec 2024	Dec 2023	MIA, 12 months to Jul 2026	All reported flights, Dec 2024
Departed on time	73.6%	76.9%	72.9%	77.8%
Arrived on time	73.7%	75.9%	72.3%	78.1%
Cancelled	0.5%	0.1%	1.6%	0.7%
Average departure delay (late minutes only)	18.3 min	15.7 min	19.7 min	16.6 min
Scheduled departures a day	331	329	305	19,686
Scheduled departures	9,937	9,861	111,186	590,581

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AA American Airlines	5,349	54%	75.0%	7.1 min	0.3%
MQ Envoy Air	1,463	15%	78.3%	0.9 min	0.6%
DL Delta Air Lines	1,029	10%	72.7%	11.2 min	0.3%
UA United Airlines	658	7%	67.9%	17.0 min	0.6%
NK Spirit Airlines	407	4%	69.8%	12.2 min	1.0%
WN Southwest Airlines	383	4%	70.5%	11.3 min	1.0%
F9 Frontier Airlines	330	3%	71.5%	14.1 min	0.6%
B6 JetBlue Airways	169	2%	49.7%	30.8 min	2.4%
AS Alaska Airlines	77	1%	59.7%	23.0 min	1.3%
YX Republic Airline	64	1%	78.1%	6.7 min	0.0%
9E Endeavor Air	8	0%	37.5%	39.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MIA–ATL	Miami to Atlanta	582	72.3%	12.0 min	0.2%
MIA–LGA	Miami to New York	519	76.7%	4.9 min	0.2%
MIA–JFK	Miami to New York	447	68.9%	13.3 min	0.4%
MIA–ORD	Miami to Chicago	406	74.9%	7.4 min	0.2%
MIA–EWR	Miami to Newark	401	64.8%	14.8 min	0.7%
MIA–DFW	Miami to Dallas/Fort Worth	399	71.4%	12.0 min	2.0%
MIA–BOS	Miami to Boston	389	67.1%	15.3 min	1.8%
MIA–CLT	Miami to Charlotte	365	79.7%	4.6 min	0.3%
MIA–DCA	Miami to Washington	353	80.2%	-0.6 min	0.3%
MIA–IAH	Miami to Houston	329	72.3%	10.8 min	0.9%
MIA–MCO	Miami to Orlando	302	75.2%	10.1 min	0.0%
MIA–PHL	Miami to Philadelphia	290	75.9%	4.1 min	0.7%

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 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2024	Minutes
Air carrier	37.4%	34.3%	61,142
Late-arriving aircraft	41.8%	40.2%	68,487
National Aviation System	19.4%	17.8%	31,742
Extreme weather	0.9%	7.5%	1,515
Security	0.5%	0.2%	773

163,659 delay minutes on 2,531 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 2024?

73.6% of 9,937 scheduled domestic departures left less than 15 minutes late, and 73.7% reached their destination on time. The national figures that month were 77.8% and 78.1%.

How does that compare with a year earlier?

In December 2023, 76.9% of 9,861 departures left on time and 0.1% were cancelled, against 73.6% and 0.5% in December 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2024; 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.