FlightRecord

Luis Munoz Marin International Airport (SJU): Delays & On-Time Performance

Data through July 2026

Luis Munoz Marin International Airport (SJU) is a tale of two seasons: departures ran 84% on-time in September 2024 but sank to 68% in August 2024. Across the year it averages 77% against a national 78%, over roughly 97 departures a day to 40 destinations.

Departures on-time
77%
left <15 min late
Avg dep delay
19 min
Arrivals on-time
73%
Cancelled
1.5%
Destinations
40
nonstop
Airlines
8

Plan your departure from SJU

The choices most likely to improve your odds, based on this airport’s historical record.

Best departure time
Around 7 a.m.
92% on-time
Best day to fly
Wednesday
81% on-time
Most reliable airline here
Delta Air Lines
86% on-time from SJU
Cancellation risk
1.5%
close to the US average
Check routes from SJU ↓Compare nearby airports ↓

Monthly on-time trend

Monthly departure on-time percentage at SJU50%75%100%August 2024: 68% on-time (3,026 flights)68Aug 2024September 2024: 84% on-time (2,068 flights)84October 2024: 84% on-time (2,325 flights)84November 2024: 82% on-time (2,829 flights)82Nov 2024December 2024: 75% on-time (3,517 flights)75January 2025: 74% on-time (3,208 flights)74February 2025: 82% on-time (2,894 flights)82Feb 2025March 2025: 79% on-time (3,580 flights)79April 2025: 81% on-time (3,121 flights)81May 2025: 82% on-time (3,067 flights)82May 2025June 2025: 81% on-time (3,187 flights)81July 2025: 74% on-time (3,415 flights)74August 2025: 71% on-time (2,975 flights)71Aug 2025September 2025: 81% on-time (1,965 flights)81October 2025: 80% on-time (2,186 flights)80November 2025: 80% on-time (2,715 flights)80Nov 2025December 2025: 75% on-time (3,393 flights)75January 2026: 70% on-time (3,306 flights)70February 2026: 74% on-time (2,835 flights)74Feb 2026March 2026: 71% on-time (3,441 flights)71April 2026: 80% on-time (3,190 flights)80May 2026: 83% on-time (2,875 flights)83May 2026June 2026: 82% on-time (3,095 flights)82July 2026: 69% on-time (3,326 flights)69

Best time of day to depart from SJU

On-time percentage by scheduled departure hour at SJU5 a.m.: 90% on-time (2,951 flights)56 a.m.: 90% on-time (6,655 flights)67 a.m.: 92% on-time (5,941 flights)78 a.m.: 90% on-time (2,735 flights)89 a.m.: 86% on-time (1,412 flights)910 a.m.: 82% on-time (2,374 flights)1011 a.m.: 81% on-time (3,234 flights)1112 p.m.: 79% on-time (3,245 flights)121 p.m.: 76% on-time (5,764 flights)132 p.m.: 76% on-time (6,107 flights)143 p.m.: 68% on-time (6,156 flights)154 p.m.: 69% on-time (5,512 flights)165 p.m.: 69% on-time (4,826 flights)176 p.m.: 70% on-time (4,444 flights)187 p.m.: 65% on-time (3,154 flights)198 p.m.: 65% on-time (2,910 flights)209 p.m.: 66% on-time (2,456 flights)2110 p.m.: 64% on-time (725 flights)2211 p.m.: 68% on-time (172 flights)23scheduled departure hour

By day of week

DayOn-timeAvg delay
Monday76%21 min
Tuesday80%16 min
Wednesdaybest81%15 min
Thursday77%18 min
Friday79%17 min
Saturday76%20 min
Sunday75%21 min

Next: compare the busiest routes from SJU ↓

Busiest routes from SJU

RouteFlights/12moOn-timeAvg delay
SJU → MCO (Orlando)6,07380%17 min
SJU → JFK (New York)3,59680%18 min
SJU → MIA (Miami)2,64378%21 min
SJU → FLL (Fort Lauderdale)2,33676%18 min
SJU → ATL (Atlanta)2,09582%14 min
SJU → EWR (Newark)2,08473%24 min
SJU → BOS (Boston)1,96173%21 min
SJU → PHL (Philadelphia)1,93470%29 min
SJU → TPA (Tampa)1,51977%18 min
SJU → ORD (Chicago)1,39478%16 min
SJU → BWI (Baltimore)1,16279%14 min
SJU → CLT (Charlotte)1,08181%17 min
SJU → DFW (Dallas/Fort Worth)98778%17 min
SJU → BDL (Hartford)96670%22 min
SJU → IAH (Houston)93085%10 min
SJU → IAD (Washington)70686%10 min
SJU → RDU (Raleigh/Durham)46779%16 min
SJU → DCA (Washington)36472%26 min
SJU → HPN (White Plains)35967%31 min
SJU → DTW (Detroit)35782%13 min
SJU → STT (Charlotte Amalie)35775%18 min
SJU → DEN (Denver)33382%11 min
SJU → STX (Christiansted)31778%14 min
SJU → PVD (Providence)29971%19 min
SJU → JAX (Jacksonville)26176%25 min
SJU → MSP (Minneapolis)15380%10 min

Compare airlines departing SJU ↓

Where flights into SJU come from

RouteFlights/12moOn-timeAvg delay
MCO (Orlando) → SJU6,07676%16 min
JFK (New York) → SJU3,59072%21 min
MIA (Miami) → SJU2,63876%19 min
FLL (Fort Lauderdale) → SJU2,33871%19 min
ATL (Atlanta) → SJU2,09972%18 min
EWR (Newark) → SJU2,08570%26 min
PHL (Philadelphia) → SJU1,93264%30 min
BOS (Boston) → SJU1,77067%26 min

Most reliable routes

  1. SJU → IAD86%
  2. SJU → IAH85%
  3. SJU → DTW82%
  4. SJU → DEN82%
  5. SJU → ATL82%

Most delay-prone routes

  1. SJU → HPN67%
  2. SJU → BDL70%
  3. SJU → PHL70%
  4. SJU → PVD71%
  5. SJU → DCA72%

What causes delays at SJU

Share of total delay minutes by cause, as reported by carriers to the US DOT, weighted across routes departing SJU.

  • Late-arriving aircraft49%
  • Airline operations35%
  • National airspace system14%
  • Weather1%

Alternative airports near San Juan

Other airports within 120 miles, compared on departure reliability.

AirportDistanceOn-time departuresAvg delay
PSE — Mercedita International Airport47 mi87%10 min
STT — Cyril E. King Airport68 mi79%21 min
BQN — Rafael Hernández International Airport74 mi78%19 min
STX — Henry E. Rohlsen Airport94 mi74%24 min

Compare the airport-level record first, then check the exact route you plan to book.

Airline performance at SJU

AirlineOn-time departuresAvg delayFlights
Delta Air Lines86%11 min7,631
United Airlines84%14 min7,204
American Airlines77%21 min9,523
Southwest Airlines77%13 min8,330
Spirit Airlines76%19 min6,608
JetBlue Airways74%22 min24,356
Frontier Airlines73%26 min11,441

Frequently asked questions

How often are flights delayed at SJU?
23% of departures from Luis Munoz Marin International Airport left 15+ minutes late between 2024-07 and 2026-07, with an average departure delay of 19 minutes. The national on-time average over the same period was 78%.
What is the best time of day to depart from SJU?
Flights scheduled around 7 a.m. depart on time 92% of the time at SJU, versus 64% around 10 p.m.. Booking before noon is the usual rule of thumb here.
What is the worst month for delays at SJU?
In this dataset, August 2024 was the weakest month at SJU, with 68% of departures on time.
How often are flights cancelled at SJU?
1.5% of scheduled departures from SJU were cancelled in this period, compared with a national rate of 1.6%.

Popular route pages from this airport

Related guides

Based on 75,109 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.