Luis Munoz Marin International in August 2025

70.1%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 2025, reporting carriers scheduled 2,975 domestic departures from Luis Munoz Marin International (SJU). 70.1% left less than 15 minutes late and 70.0% reached their destination on time; 0.8% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so SJU departures were 6.7 points below the national departure figure.

A year earlier, in August 2024, the airport had 3,026 departures with 66.3% leaving on time: a change of +3.8 points, with flights down 2%.

Flights arriving at SJU that month were on time 65.9% of the time (2,963 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 51%, air carrier 30% and national aviation system 18%.

On time 70.0%
Arrived 15+ minutes late 28.7%
Cancelled 0.8%
Diverted 0.5%

Every scheduled departure from SJU in August 2025, judged by arrival at the destination.

August 2025 against a year earlier, the airport's year and the nation

Measure	Aug 2025	Aug 2024	SJU, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	70.1%	66.3%	74.5%	76.8%
Arrived on time	70.0%	65.8%	75.6%	76.3%
Cancelled	0.8%	2.5%	2.0%	1.1%
Average departure delay (late minutes only)	24.5 min	29.7 min	19.6 min	17.6 min
Scheduled departures a day	99	101	97	20,079
Scheduled departures	2,975	3,026	35,302	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	1,081	36%	66.1%	21.8 min	0.7%
F9 Frontier Airlines	443	15%	55.8%	30.0 min	2.5%
AA American Airlines	314	11%	73.6%	16.5 min	0.3%
WN Southwest Airlines	301	10%	78.4%	8.0 min	0.0%
NK Spirit Airlines	295	10%	74.6%	10.3 min	0.3%
UA United Airlines	281	9%	74.7%	3.2 min	0.4%
DL Delta Air Lines	260	9%	86.2%	-5.1 min	0.4%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SJU–MCO	San Juan to Orlando	526	71.1%	14.5 min	0.4%
SJU–JFK	San Juan to New York	359	73.0%	11.3 min	0.3%
SJU–MIA	San Juan to Miami	210	73.3%	20.0 min	0.5%
SJU–FLL	San Juan to Fort Lauderdale	195	66.7%	24.1 min	1.0%
SJU–EWR	San Juan to Newark	193	68.4%	14.5 min	1.0%
SJU–BOS	San Juan to Boston	186	64.5%	17.8 min	1.1%
SJU–ATL	San Juan to Atlanta	156	78.2%	5.0 min	0.6%
SJU–PHL	San Juan to Philadelphia	129	61.2%	16.7 min	2.3%
SJU–ORD	San Juan to Chicago	115	74.8%	14.2 min	0.0%
SJU–TPA	San Juan to Tampa	114	62.3%	31.4 min	0.9%
SJU–BWI	San Juan to Baltimore	104	80.8%	5.9 min	1.9%
SJU–IAH	San Juan to Houston	94	80.9%	-4.5 min	0.0%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	29.6%	33.1%	20,300
Late-arriving aircraft	50.7%	40.5%	34,746
National Aviation System	17.6%	19.2%	12,060
Extreme weather	2.1%	7.0%	1,440
Security	0.0%	0.1%	0

68,546 delay minutes on 853 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 SJU on time in August 2025?

70.1% of 2,975 scheduled domestic departures left less than 15 minutes late, and 70.0% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 66.3% of 3,026 departures left on time and 2.5% were cancelled, against 70.1% and 0.8% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for SJU · methodology · corrections.