Airport month record
SJUMAR
Luis Munoz Marin International in March 2026
- Departures
- 3,441
- Month
- March 2026
- National, same month
- 75.7%
- Carriers
- 7
Historical statistics for March 2026, not live status or a forecast for this year’s March. For today’s conditions at SJU, see live FAA status.
SJU in March sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, level with the national rate of 75.7%. The late ones land a little over an hour behind schedule. That rests on 3,441 flights, of which American Airlines flew 564 at 81.5% on time.
American Airlines is the most reliable of the four carriers covered here at 81.5% on time across 564 flights.
Key figures
On time
75.1%
Arrivals under 15 minutes late, of 3,351 completed departures
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
2.06%
Nationally in March: 2.90%
Whole year
77.8%
SJU across all twelve months
These figures cover 3,441 departures from Luis Munoz Marin International in March 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
March next to SJU's other months
Against SJU's own year, March ran 3 points worse than the twelve-month rate of 77.8%, which makes it number nine of twelve months, best first. Either side of it, February ran 74.7% on time and April 78.4%, so this month sits in line with its neighbours.
| 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 (this page) | 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 March
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 27 points, against 25 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am813 flights89.9%
- 8am–11am262 flights82.1%
- 11am–2pm591 flights77.4%
- 2pm–5pm829 flights69.0%
- 5pm–8pm498 flights65.4%
- 8pm–5am448 flights62.7%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 62.7% on time, against 89.9% 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 829 flights scheduled in it.
Across the week, Wednesday is the strongest day at 81.8% on time and Saturday the weakest at 65.7%. 16 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at SJU in March
The choice of carrier is not cosmetic here. American Airlines arrives on time 81.5% of the time; Spirit Airlines manages 56.1%. Sample sizes sit next to every figure, because a two-point gap across 420 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 1,080 | 75.2% | 74 min | 1.02% | B |
| American Airlines | 564 | 81.5% | 83 min | 0.18% | B+ |
| Spirit Airlines | 420 | 56.1% | 72 min | 10.00% | D− |
| Frontier Airlines | 381 | 67.2% | 80 min | 2.36% | C |
| Delta Air Linesthin sample | 357 | 87.1% | 69 min | 1.40% | A |
| United Airlinesthin sample | 327 | 85.8% | 81 min | 0.31% | A+ |
| Southwest Airlinesthin sample | 312 | 71.2% | 52 min | 0.64% | C+ |
Spirit Airlines cancels 10.0% 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 March
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SJU to MCO · Orlando | 517 | 71.9% | 73 min | 1.93% | C |
| SJU to JFK · New Yorkthin sample | 305 | 83.1% | 82 min | 0.66% | B+ |
| SJU to MIA · Miamithin sample | 278 | 77.1% | 79 min | 0.72% | B+ |
| SJU to BOS · Bostonthin sample | 235 | 75.3% | 73 min | 1.70% | B |
| SJU to FLL · Fort Lauderdalethin sample | 233 | 62.4% | 80 min | 1.29% | D |
| SJU to ATL · Atlantathin sample | 229 | 73.6% | 75 min | 3.06% | C− |
| SJU to PHL · Philadelphiathin sample | 203 | 63.4% | 85 min | 2.96% | D |
| SJU to EWR · Newarkthin sample | 188 | 74.6% | 81 min | 1.60% | C |
| SJU to ORD · Chicagothin sample | 177 | 75.6% | 50 min | 6.78% | B− |
| SJU to TPA · Tampathin sample | 150 | 76.9% | 52 min | 4.00% | B− |
| SJU to CLT · Charlottethin sample | 135 | 88.1% | 105 min | 0.00% | A+ |
| SJU to DFW · Dallas-Fort Worththin sample | 113 | 84.1% | 73 min | 3.54% | B− |
| SJU to BWI · Baltimorethin sample | 109 | 64.1% | 55 min | 5.50% | D− |
| SJU to BDL · Hartfordthin sample | 83 | 70.7% | 60 min | 1.20% | C |
| SJU to IAH · Houstonthin sample | 76 | 88.2% | 60 min | 0.00% | A+ |
| SJU to IAD · Washingtonthin sample | 67 | 86.6% | 64 min | 0.00% | A+ |
| SJU to RDU · Raleighthin sample | 49 | 77.6% | 95 min | 0.00% | B+ |
| SJU to MSP · Minneapolisthin sample | 35 | 93.8% | 45 min | 5.71% | A− |
| SJU to STT · Charlotte Amaliethin sample | 31 | 74.2% | 44 min | 0.00% | C+ |
| SJU to DCA · Washingtonthin sample | 31 | 80.0% | 138 min | 3.23% | B− |
| SJU to STX · Christianstedthin sample | 31 | 77.4% | 63 min | 0.00% | B+ |
| SJU to DEN · Denverthin sample | 31 | 100.0% | — | 0.00% | A+ |
| SJU to DTW · Detroitthin sample | 31 | 83.3% | 22 min | 3.23% | B− |
| SJU to HPN · White Plainsthin sample | 31 | 77.4% | 62 min | 0.00% | B+ |
Delay causes
What held SJU up in March
One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 61,000 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.
- 58%Late-arriving aircraft
- 28%Carrier
- 13%National Airspace System
- 0%Extreme weather
- 0%Security
58% 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 61,000 reported delay minutes here, that single category outweighs weather by 58 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 61,020 reported delay minutes.
Cancellations sit at 2.06% against a national 2.90%, which is ordinary. Diversions add another 0.55%.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.5% of arrivals land a full hour or more behind schedule, against 9.5% 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 March
For a March trip through SJU: expect 75.1% on time and 2.06% cancelled, going by March 2026. The 5am–8am window was the strongest part of the 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 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.