Airport month record
SJUJAN
Luis Munoz Marin International in January 2026
- Departures
- 3,306
- Month
- January 2026
- National, same month
- 79.2%
- Carriers
- 7
Historical statistics for January 2026, not live status or a forecast for this year’s January. For today’s conditions at SJU, see live FAA status.
SJU in January carries a cancellation problem, not just a delay problem: 8.0% of scheduled flights never operate, against 4.7% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 3,306 flights, of which American Airlines flew 523 at 73.1% on time.
The national on-time rate over the same period is 79.2%, so sju in january runs 6 points behind the country as a whole. Across a thousand flights that is about 59 extra late arrivals.
Key figures
On time
73.3%
Arrivals under 15 minutes late, of 3,033 completed departures
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
7.96%
Nationally in January: 4.71%
Whole year
77.8%
SJU across all twelve months
These figures cover 3,306 departures from Luis Munoz Marin International in January 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
January next to SJU's other months
Against SJU's own year, January ran 5 points worse than the twelve-month rate of 77.8%, which makes it number eleven of twelve months, best first. Cancellations are where January stands out: 7.96% of scheduled departures were called off, 4.3 times the airport's rate across the year. Either side of it, December ran 78.4% on time and February 74.7%, so a trip moved by a few weeks would have landed in a better stretch.
| 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 (this page) | 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 | 3,095 | 83.1% | 76 min | 0.61% | B+ |
Departure window
The best time of day to leave SJU in January
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against 6 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am665 flights83.9%
- 8am–11am348 flights83.2%
- 11am–2pm342 flights79.2%
- 2pm–5pm957 flights66.6%
- 5pm–8pm674 flights68.6%
- 8pm–5am320 flights63.8%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 63.8% on time, against 83.9% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 957 flights scheduled in it.
Across the week, Wednesday is the strongest day at 79.8% on time and Monday the weakest at 60.6%. 19 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at SJU in January
The choice of carrier is not cosmetic here. American Airlines arrives on time 73.1% of the time; Frontier Airlines manages 67.1%. Sample sizes sit next to every figure, because a two-point gap across 503 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 978 | 68.6% | 84 min | 8.18% | C− |
| American Airlines | 523 | 73.1% | 142 min | 9.75% | C− |
| Frontier Airlines | 503 | 67.1% | 93 min | 7.95% | C− |
| Delta Air Linesthin sample | 361 | 80.4% | 100 min | 6.37% | B− |
| United Airlinesthin sample | 331 | 81.5% | 56 min | 5.44% | B− |
| Southwest Airlinesthin sample | 318 | 82.2% | 41 min | 6.29% | B− |
| Spirit Airlinesthin sample | 292 | 71.5% | 82 min | 10.62% | C− |
American Airlines cancels 9.8% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Busiest routes out of SJU in January
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SJU to MCO · Orlando | 510 | 77.2% | 85 min | 4.31% | B− |
| SJU to JFK · New Yorkthin sample | 310 | 73.7% | 97 min | 9.35% | C− |
| SJU to MIA · Miamithin sample | 250 | 72.5% | 115 min | 6.40% | C− |
| SJU to EWR · Newarkthin sample | 217 | 74.1% | 71 min | 9.22% | C− |
| SJU to FLL · Fort Lauderdalethin sample | 217 | 66.7% | 62 min | 6.91% | C− |
| SJU to BOS · Bostonthin sample | 207 | 63.6% | 108 min | 11.11% | D− |
| SJU to ATL · Atlantathin sample | 195 | 77.7% | 126 min | 4.62% | B− |
| SJU to PHL · Philadelphiathin sample | 194 | 59.0% | 111 min | 10.82% | D− |
| SJU to ORD · Chicagothin sample | 154 | 77.1% | 92 min | 8.44% | B− |
| SJU to TPA · Tampathin sample | 133 | 84.7% | 56 min | 6.77% | B− |
| SJU to CLT · Charlottethin sample | 121 | 80.4% | 204 min | 9.92% | B− |
| SJU to BWI · Baltimorethin sample | 109 | 80.8% | 85 min | 9.17% | B− |
| SJU to DFW · Dallas-Fort Worththin sample | 103 | 56.8% | 74 min | 14.56% | D− |
| SJU to BDL · Hartfordthin sample | 86 | 67.9% | 68 min | 9.30% | C− |
| SJU to IAH · Houstonthin sample | 81 | 88.3% | 42 min | 4.94% | A− |
| SJU to IAD · Washingtonthin sample | 74 | 89.9% | 100 min | 6.76% | A− |
| SJU to RDU · Raleighthin sample | 45 | 92.3% | 100 min | 13.33% | A− |
| SJU to DTW · Detroitthin sample | 36 | 67.6% | 36 min | 5.56% | C− |
| SJU to MSP · Minneapolisthin sample | 34 | 78.1% | 44 min | 5.88% | B− |
| SJU to STT · Charlotte Amaliethin sample | 31 | 60.0% | 82 min | 3.23% | D− |
| SJU to DCA · Washingtonthin sample | 31 | 44.4% | 99 min | 12.90% | F− |
| SJU to STX · Christianstedthin sample | 31 | 66.7% | 51 min | 3.23% | C− |
| SJU to PVD · Providencethin sample | 31 | 62.1% | 60 min | 6.45% | D− |
| SJU to HPN · White Plainsthin sample | 31 | 82.1% | 109 min | 6.45% | B− |
| SJU to DEN · Denverthin sample | 31 | 83.3% | 106 min | 3.23% | B− |
Delay causes
What held SJU up in January
One category carries most of the weight here. Carrier accounts for 44% of the 74,000 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.
- 44%Carrier
- 40%Late-arriving aircraft
- 11%National Airspace System
- 5%Extreme weather
- 0%Security
40% 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 74,000 reported delay minutes here, that single category outweighs weather by 9 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 73,762 reported delay minutes.
Cancellations run at 7.96%, against 4.71% nationally. That is about one flight in twelve cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.6% of arrivals land a full hour or more behind schedule, against 7.6% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
What to do with this
Flying from SJU in January
For a January trip through SJU: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 83.9% on time, and with 10.6% of arrivals an hour or more late, a connection here deserves more slack than the same trip in May would.
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 February74.7%
- SJU in March75.1%
- SJU in April78.4%
- SJU in May84.7%
- SJU in June83.1%
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.