Luis Munoz Marin International in September 2025

80.5%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 September 2025, reporting carriers scheduled 1,965 domestic departures from Luis Munoz Marin International (SJU). 80.5% left less than 15 minutes late and 80.5% reached their destination on time; 0.0% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so SJU departures were 2.6 points below the national departure figure.

A year earlier, in September 2024, the airport had 2,068 departures with 83.9% leaving on time: a change of −3.4 points, with flights down 5%.

Flights arriving at SJU that month were on time 77.8% of the time (1,959 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 49%, air carrier 36% and national aviation system 14%.

On time 80.5%
Arrived 15+ minutes late 19.2%
Cancelled 0.0%
Diverted 0.4%

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

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

Measure	Sep 2025	Sep 2024	SJU, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	80.5%	83.9%	74.5%	83.1%
Arrived on time	80.5%	83.6%	75.6%	82.8%
Cancelled	0.0%	0.6%	2.0%	0.5%
Average departure delay (late minutes only)	15.0 min	13.5 min	19.6 min	12.2 min
Scheduled departures a day	66	69	97	18,748
Scheduled departures	1,965	2,068	35,302	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	648	33%	75.9%	7.1 min	0.0%
WN Southwest Airlines	261	13%	86.2%	0.8 min	0.0%
F9 Frontier Airlines	256	13%	75.8%	4.9 min	0.0%
DL Delta Air Lines	237	12%	89.9%	-5.2 min	0.0%
UA United Airlines	202	10%	81.2%	5.1 min	0.0%
AA American Airlines	200	10%	79.5%	10.7 min	0.0%
NK Spirit Airlines	161	8%	83.2%	-4.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SJU–MCO	San Juan to Orlando	428	84.8%	0.9 min	0.0%
SJU–JFK	San Juan to New York	248	83.9%	-2.7 min	0.0%
SJU–MIA	San Juan to Miami	168	77.4%	15.2 min	0.0%
SJU–EWR	San Juan to Newark	151	73.5%	14.7 min	0.0%
SJU–ATL	San Juan to Atlanta	128	86.7%	2.2 min	0.0%
SJU–FLL	San Juan to Fort Lauderdale	121	76.9%	6.8 min	0.0%
SJU–BOS	San Juan to Boston	84	75.0%	5.0 min	0.0%
SJU–TPA	San Juan to Tampa	83	90.4%	0.3 min	0.0%
SJU–BWI	San Juan to Baltimore	70	82.9%	-1.3 min	0.0%
SJU–IAH	San Juan to Houston	68	94.1%	-10.2 min	0.0%
SJU–PHL	San Juan to Philadelphia	65	61.5%	13.1 min	0.0%
SJU–BDL	San Juan to Hartford	54	61.1%	29.0 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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	36.4%	34.3%	9,388
Late-arriving aircraft	49.1%	37.4%	12,668
National Aviation System	13.5%	22.6%	3,483
Extreme weather	1.0%	5.6%	267
Security	0.1%	0.1%	16

25,822 delay minutes on 377 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 September 2025?

80.5% of 1,965 scheduled domestic departures left less than 15 minutes late, and 80.5% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 83.9% of 2,068 departures left on time and 0.6% were cancelled, against 80.5% and 0.0% in September 2025.

Provenance

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