Luis Munoz Marin International in May 2026

83.0%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 2,875 domestic departures from Luis Munoz Marin International (SJU). 83.0% left less than 15 minutes late and 84.1% reached their destination on time; 0.2% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so SJU departures were 5.9 points above the national departure figure.

A year earlier, in May 2025, the airport had 3,067 departures with 82.1% leaving on time: a change of +0.9 points, with flights down 6%.

Flights arriving at SJU that month were on time 79.4% of the time (2,878 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, air carrier 40% and national aviation system 13%.

On time 84.1%
Arrived 15+ minutes late 15.2%
Cancelled 0.2%
Diverted 0.4%

Every scheduled departure from SJU 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	SJU, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	83.0%	82.1%	74.5%	77.1%
Arrived on time	84.1%	81.2%	75.6%	77.6%
Cancelled	0.2%	0.1%	2.0%	0.9%
Average departure delay (late minutes only)	12.0 min	13.2 min	19.6 min	16.0 min
Scheduled departures a day	96	102	97	20,391
Scheduled departures	2,875	3,067	35,302	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	1,007	35%	85.1%	-1.1 min	0.0%
F9 Frontier Airlines	457	16%	83.4%	2.3 min	0.0%
AA American Airlines	452	16%	82.3%	8.0 min	0.4%
UA United Airlines	320	11%	87.2%	-2.6 min	0.3%
WN Southwest Airlines	316	11%	76.3%	8.2 min	0.0%
DL Delta Air Lines	314	11%	90.4%	-6.7 min	0.6%
NK Spirit Airlines	9	0%	55.6%	19.8 min	11.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SJU–MCO	San Juan to Orlando	475	85.7%	2.5 min	0.2%
SJU–JFK	San Juan to New York	254	87.8%	-4.9 min	0.4%
SJU–MIA	San Juan to Miami	216	79.6%	15.4 min	0.0%
SJU–PHL	San Juan to Philadelphia	197	84.8%	1.6 min	0.5%
SJU–ATL	San Juan to Atlanta	185	85.9%	-4.2 min	0.5%
SJU–FLL	San Juan to Fort Lauderdale	174	78.7%	2.4 min	0.0%
SJU–BOS	San Juan to Boston	145	82.1%	2.0 min	0.0%
SJU–EWR	San Juan to Newark	135	85.2%	3.9 min	0.7%
SJU–TPA	San Juan to Tampa	116	71.6%	11.2 min	0.0%
SJU–ORD	San Juan to Chicago	105	81.0%	-0.3 min	0.0%
SJU–CLT	San Juan to Charlotte	95	83.2%	4.7 min	1.1%
SJU–BDL	San Juan to Hartford	93	87.1%	-6.2 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	40.4%	33.0%	11,299
Late-arriving aircraft	46.0%	40.4%	12,888
National Aviation System	13.4%	20.5%	3,762
Extreme weather	0.1%	6.0%	21
Security	0.1%	0.1%	23

27,993 delay minutes on 438 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 May 2026?

83.0% of 2,875 scheduled domestic departures left less than 15 minutes late, and 84.1% 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, 82.1% of 3,067 departures left on time and 0.1% were cancelled, against 83.0% and 0.2% 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 SJU · methodology · corrections.