Miami International in May 2026

75.5%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 May 2026, reporting carriers scheduled 9,296 domestic departures from Miami International (MIA). 75.5% left less than 15 minutes late and 74.7% reached their destination on time; 0.5% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so MIA departures were 1.6 points below the national departure figure.

A year earlier, in May 2025, the airport had 9,440 departures with 74.3% leaving on time: a change of +1.2 points, with flights down 2%.

Flights arriving at MIA that month were on time 79.0% of the time (9,299 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 43%, air carrier 34% and national aviation system 20%.

On time 74.7%
Arrived 15+ minutes late 24.5%
Cancelled 0.5%
Diverted 0.4%

Every scheduled departure from MIA in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	MIA, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	75.5%	74.3%	72.9%	77.1%
Arrived on time	74.7%	70.3%	72.3%	77.6%
Cancelled	0.5%	0.9%	1.6%	0.9%
Average departure delay (late minutes only)	17.4 min	19.7 min	19.7 min	16.0 min
Scheduled departures a day	310	315	305	20,391
Scheduled departures	9,296	9,440	111,186	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AA American Airlines	5,568	60%	72.4%	12.5 min	0.4%
MQ Envoy Air	1,204	13%	85.0%	-2.1 min	0.0%
DL Delta Air Lines	991	11%	77.2%	5.5 min	1.1%
UA United Airlines	561	6%	80.6%	-0.7 min	0.5%
WN Southwest Airlines	515	6%	63.9%	16.0 min	0.2%
F9 Frontier Airlines	347	4%	74.6%	6.9 min	0.3%
YX Republic Airline	68	1%	72.1%	4.2 min	0.0%
AS Alaska Airlines	31	0%	74.2%	-2.3 min	3.2%
NK Spirit Airlines	11	0%	72.7%	29.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
MIA–ATL	Miami to Atlanta	552	72.8%	11.6 min	0.5%
MIA–LGA	Miami to New York	458	70.7%	13.4 min	2.0%
MIA–DFW	Miami to Dallas/Fort Worth	398	70.9%	17.2 min	3.0%
MIA–JFK	Miami to New York	398	75.9%	6.2 min	1.0%
MIA–ORD	Miami to Chicago	354	73.4%	10.2 min	0.6%
MIA–DCA	Miami to Washington	339	79.6%	4.6 min	0.6%
MIA–EWR	Miami to Newark	315	80.6%	9.0 min	0.3%
MIA–LAX	Miami to Los Angeles	304	76.0%	4.7 min	0.7%
MIA–MCO	Miami to Orlando	303	72.6%	13.9 min	0.0%
MIA–CLT	Miami to Charlotte	294	78.2%	4.0 min	0.0%
MIA–IAH	Miami to Houston	294	73.8%	5.9 min	0.7%
MIA–BOS	Miami to Boston	280	77.1%	4.8 min	0.4%

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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	33.5%	33.0%	50,232
Late-arriving aircraft	42.8%	40.4%	64,172
National Aviation System	20.4%	20.5%	30,604
Extreme weather	2.9%	6.0%	4,398
Security	0.2%	0.1%	365

149,771 delay minutes on 2,278 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 May 2026?

75.5% of 9,296 scheduled domestic departures left less than 15 minutes late, and 74.7% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 74.3% of 9,440 departures left on time and 0.9% were cancelled, against 75.5% and 0.5% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.