Luis Munoz Marin International in December 2025

73.8%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 2025, reporting carriers scheduled 3,393 domestic departures from Luis Munoz Marin International (SJU). 73.8% left less than 15 minutes late and 76.8% reached their destination on time; 1.8% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so SJU departures were 1.8 points above the national departure figure.

A year earlier, in December 2024, the airport had 3,517 departures with 74.7% leaving on time: a change of −0.9 points, with flights down 4%.

Flights arriving at SJU that month were on time 66.8% of the time (3,401 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 52%, air carrier 36% and national aviation system 12%.

On time 76.8%
Arrived 15+ minutes late 21.2%
Cancelled 1.8%
Diverted 0.3%

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

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

Measure	Dec 2025	Dec 2024	SJU, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	73.8%	74.7%	74.5%	72.0%
Arrived on time	76.8%	74.0%	75.6%	71.9%
Cancelled	1.8%	0.4%	2.0%	1.5%
Average departure delay (late minutes only)	19.7 min	19.2 min	19.6 min	21.2 min
Scheduled departures a day	113	117	97	19,410
Scheduled departures	3,393	3,517	35,302	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
B6 JetBlue Airways	1,097	32%	71.3%	12.6 min	2.2%
F9 Frontier Airlines	502	15%	71.1%	12.8 min	2.8%
AA American Airlines	484	14%	81.6%	4.2 min	0.4%
DL Delta Air Lines	354	10%	84.2%	-5.7 min	3.4%
UA United Airlines	336	10%	85.7%	-4.8 min	0.3%
WN Southwest Airlines	322	9%	85.1%	2.5 min	0.0%
NK Spirit Airlines	298	9%	71.1%	18.0 min	2.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SJU–MCO	San Juan to Orlando	534	78.1%	9.7 min	0.4%
SJU–JFK	San Juan to New York	351	74.4%	5.1 min	4.8%
SJU–FLL	San Juan to Fort Lauderdale	262	78.2%	7.7 min	1.5%
SJU–MIA	San Juan to Miami	258	82.2%	9.0 min	0.8%
SJU–EWR	San Juan to Newark	197	73.1%	8.2 min	2.5%
SJU–ATL	San Juan to Atlanta	192	81.8%	1.3 min	3.6%
SJU–BOS	San Juan to Boston	189	66.1%	16.4 min	1.6%
SJU–PHL	San Juan to Philadelphia	164	54.3%	32.3 min	3.7%
SJU–TPA	San Juan to Tampa	142	75.4%	9.9 min	0.7%
SJU–ORD	San Juan to Chicago	129	78.3%	8.2 min	0.8%
SJU–CLT	San Juan to Charlotte	121	90.1%	-7.8 min	0.0%
SJU–BWI	San Juan to Baltimore	113	83.2%	3.8 min	0.9%

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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	36.1%	33.3%	20,488
Late-arriving aircraft	51.7%	41.1%	29,331
National Aviation System	11.9%	19.1%	6,723
Extreme weather	0.2%	6.4%	124
Security	0.0%	0.2%	20

56,686 delay minutes on 718 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 December 2025?

73.8% of 3,393 scheduled domestic departures left less than 15 minutes late, and 76.8% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 74.7% of 3,517 departures left on time and 0.4% were cancelled, against 73.8% and 1.8% in December 2025.

Provenance

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