Airport month record
SJUJUN
Luis Munoz Marin International in June 2026
- Departures
- 3,095
- Month
- June 2026
- National, same month
- 74.3%
- Carriers
- 6
Historical statistics for June 2026, not live status or a forecast for this year’s June. For today’s conditions at SJU, see live FAA status.
SJU in June lands a B+, 9 points better than the national rate of 74.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 3,095 flights, of which American Airlines flew 390 at 85.8% on time.
American Airlines is the most reliable of the four carriers covered here at 85.8% on time across 390 flights.
Key figures
On time
83.1%
Arrivals under 15 minutes late, of 3,065 completed departures
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
Nationally in June: 1.65%
Whole year
77.8%
SJU across all twelve months
These figures cover 3,095 departures from Luis Munoz Marin International in June 2026. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
June next to SJU's other months
Against SJU's own year, June ran 5 points better than the twelve-month rate of 77.8%, which makes it number two of twelve months, best first. Cancellations were unusually low for SJU in June, at 0.61% against 1.83% across the year.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| July 2025 | 3,415 | 75.4% | 80 min | 1.55% | B |
| August 2025 | 2,975 | 70.9% | 80 min | 0.77% | C+ |
| September 2025 | 1,965 | 80.7% | 69 min | 0.00% | B+ |
| October 2025 | 2,186 | 79.1% | 68 min | 0.46% | B+ |
| November 2025 | 2,715 | 81.8% | 87 min | 1.07% | B |
| December 2025 | 3,393 | 78.4% | 79 min | 1.77% | B |
| January 2026 | 3,306 | 73.3% | 91 min | 7.96% | C− |
| February 2026 | 2,835 | 74.7% | 79 min | 3.17% | C− |
| March 2026 | 3,441 | 75.1% | 73 min | 2.06% | B |
| April 2026 | 3,190 | 78.4% | 68 min | 0.75% | B+ |
| May 2026 | 2,875 | 84.7% | 64 min | 0.21% | B+ |
| June 2026 (this page) | 3,095 | 83.1% | 76 min | 0.61% | B+ |
Departure window
The best time of day to leave SJU in June
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am812 flights90.4%
- 8am–11am289 flights87.1%
- 11am–2pm416 flights80.7%
- 2pm–5pm590 flights80.0%
- 5pm–8pm559 flights78.1%
- 8pm–5am429 flights79.5%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.4% of the time, against 78.1% for the evening window. That is 12 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 812 flights scheduled in it.
Across the week, Wednesday is the strongest day at 89.1% on time and Sunday the weakest at 77.6%. 12 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at SJU in June
The four carriers here are closely matched: 5 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 1,180 | 80.4% | 73 min | 0.68% | B+ |
| Frontier Airlines | 466 | 81.8% | 118 min | 1.07% | B |
| Southwest Airlines | 433 | 81.3% | 55 min | 0.69% | B+ |
| American Airlines | 390 | 85.8% | 79 min | 0.26% | A+ |
| United Airlinesthin sample | 330 | 87.2% | 53 min | 0.30% | A+ |
| Delta Air Linesthin sample | 296 | 90.1% | 57 min | 0.34% | A+ |
No carrier stands out. American tops the table at 85.8%, 5 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Route by route
Busiest routes out of SJU in June
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SJU to MCO · Orlando | 601 | 81.0% | 89 min | 1.00% | B |
| SJU to JFK · New Yorkthin sample | 289 | 83.9% | 68 min | 1.38% | B |
| SJU to MIA · Miamithin sample | 214 | 87.4% | 73 min | 0.00% | A+ |
| SJU to FLL · Fort Lauderdalethin sample | 192 | 81.2% | 70 min | 0.52% | B+ |
| SJU to PHL · Philadelphiathin sample | 180 | 85.8% | 78 min | 1.67% | A |
| SJU to ATL · Atlantathin sample | 175 | 87.9% | 67 min | 0.00% | A+ |
| SJU to TPA · Tampathin sample | 166 | 78.0% | 73 min | 0.60% | B+ |
| SJU to EWR · Newarkthin sample | 161 | 82.5% | 81 min | 0.62% | B+ |
| SJU to BOS · Bostonthin sample | 136 | 79.3% | 78 min | 0.00% | B+ |
| SJU to BWI · Baltimorethin sample | 109 | 88.1% | 76 min | 0.00% | A+ |
| SJU to BDL · Hartfordthin sample | 90 | 81.1% | 63 min | 0.00% | B+ |
| SJU to ORD · Chicagothin sample | 90 | 86.5% | 31 min | 0.00% | A+ |
| SJU to IAH · Houstonthin sample | 90 | 90.0% | 32 min | 0.00% | A+ |
| SJU to CLT · Charlottethin sample | 77 | 90.7% | 68 min | 1.30% | A |
| SJU to DFW · Dallas-Fort Worththin sample | 61 | 75.4% | 86 min | 0.00% | B+ |
| SJU to IAD · Washingtonthin sample | 60 | 93.3% | 48 min | 0.00% | A+ |
| SJU to JAX · Jacksonvillethin sample | 59 | 79.7% | 152 min | 0.00% | B+ |
| SJU to RDU · Raleighthin sample | 43 | 81.4% | 66 min | 0.00% | B+ |
| SJU to STT · Charlotte Amaliethin sample | 30 | 63.3% | 35 min | 0.00% | D+ |
| SJU to DCA · Washingtonthin sample | 30 | 73.3% | 88 min | 0.00% | C+ |
| SJU to STX · Christianstedthin sample | 30 | 86.7% | 37 min | 0.00% | A+ |
| SJU to DTW · Detroitthin sample | 30 | 82.8% | 74 min | 3.33% | B− |
| SJU to DEN · Denverthin sample | 30 | 86.7% | 52 min | 0.00% | A+ |
Delay causes
What held SJU up in June
One category carries most of the weight here. Late-arriving aircraft accounts for 61% of the 39,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 61%Late-arriving aircraft
- 27%Carrier
- 12%National Airspace System
- 0%Extreme weather
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 39,000 reported delay minutes here, that single category outweighs weather by 61 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 39,343 reported delay minutes.
Cancellations are rare at 0.61%, below the national 1.65% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
5.6% of arrivals land an hour or more late, close to the national 9.7%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
What to do with this
Flying from SJU in June
For a June trip through SJU: this is one of the better months to be flying from here, 83.1% on time with 0.61% cancelled. That is a base rate for the month as a whole; a single storm can still spoil a particular day.
Related
Where to go next
- Luis Munoz Marin International (SJU), the whole year
- SJU in July75.4%
- SJU in August70.9%
- SJU in September80.7%
- SJU in October79.1%
- SJU in November81.8%
- SJU in December78.4%
- SJU in January73.3%
- SJU in February74.7%
- SJU in March75.1%
- SJU in April78.4%
- SJU in May84.7%
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.