Airport month record
SJUAPR
Luis Munoz Marin International in April 2026
- Departures
- 3,190
- Month
- April 2026
- National, same month
- 79.8%
- Carriers
- 7
Historical statistics for April 2026, not live status or a forecast for this year’s April. For today’s conditions at SJU, see live FAA status.
SJU in April lands a B+, about a point worse than the national rate of 79.8%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 3,190 flights, of which American Airlines flew 484 at 81.9% on time.
American Airlines is the most reliable of the three carriers covered here at 81.9% on time across 484 flights.
Key figures
On time
78.4%
Arrivals under 15 minutes late, of 3,156 completed departures
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
0.75%
Nationally in April: 0.90%
Whole year
77.8%
SJU across all twelve months
These figures cover 3,190 departures from Luis Munoz Marin International in April 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
April next to SJU's other months
Against SJU's own year, April ran level with the twelve-month rate of 77.8%, which makes it number seven of twelve months, best first. Cancellations were unusually low for SJU in April, at 0.75% against 1.83% across the year. Either side of it, March ran 75.1% on time and May 84.7%, 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 | 3,441 | 75.1% | 73 min | 2.06% | B |
| April 2026 (this page) | 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 April
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 11 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am772 flights89.2%
- 8am–11am196 flights82.1%
- 11am–2pm660 flights76.4%
- 2pm–5pm735 flights71.6%
- 5pm–8pm443 flights76.2%
- 8pm–5am384 flights73.1%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.2% of the time, against 71.6% for the afternoon window. That is 18 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 772 flights scheduled in it.
Across the week, Friday is the strongest day at 84.0% on time and Monday the weakest at 73.6%. 10 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at SJU in April
The choice of carrier is not cosmetic here. American Airlines arrives on time 81.9% of the time; Frontier Airlines manages 71.1%. Sample sizes sit next to every figure, because a two-point gap across 434 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 1,027 | 78.2% | 57 min | 0.19% | B+ |
| American Airlines | 484 | 81.9% | 93 min | 0.21% | B+ |
| Frontier Airlines | 434 | 71.1% | 101 min | 1.15% | C |
| Spirit Airlinesthin sample | 329 | 65.1% | 63 min | 4.26% | C− |
| Delta Air Linesthin sample | 318 | 87.7% | 54 min | 0.31% | A+ |
| United Airlinesthin sample | 300 | 88.9% | 41 min | 0.33% | A+ |
| Southwest Airlinesthin sample | 298 | 77.2% | 40 min | 0.00% | B+ |
American leads Frontier by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Route by route
Busiest routes out of SJU in April
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SJU to MCO · Orlando | 480 | 79.2% | 87 min | 0.83% | B+ |
| SJU to JFK · New Yorkthin sample | 310 | 84.1% | 53 min | 0.00% | B+ |
| SJU to MIA · Miamithin sample | 238 | 73.9% | 93 min | 0.00% | C+ |
| SJU to PHL · Philadelphiathin sample | 224 | 80.6% | 97 min | 3.12% | B− |
| SJU to BOS · Bostonthin sample | 215 | 69.8% | 46 min | 0.00% | C+ |
| SJU to ATL · Atlantathin sample | 201 | 74.1% | 49 min | 0.00% | C+ |
| SJU to EWR · Newarkthin sample | 191 | 81.0% | 81 min | 0.52% | B+ |
| SJU to FLL · Fort Lauderdalethin sample | 180 | 69.5% | 53 min | 1.67% | C |
| SJU to ORD · Chicagothin sample | 138 | 85.5% | 98 min | 1.45% | A |
| SJU to TPA · Tampathin sample | 123 | 65.0% | 53 min | 2.44% | C |
| SJU to BWI · Baltimorethin sample | 111 | 68.2% | 59 min | 0.90% | C+ |
| SJU to CLT · Charlottethin sample | 108 | 83.3% | 115 min | 0.00% | B+ |
| SJU to DFW · Dallas-Fort Worththin sample | 107 | 79.8% | 55 min | 0.93% | B+ |
| SJU to BDL · Hartfordthin sample | 90 | 71.1% | 52 min | 0.00% | C+ |
| SJU to IAD · Washingtonthin sample | 62 | 93.5% | 66 min | 0.00% | A+ |
| SJU to IAH · Houstonthin sample | 60 | 88.3% | 25 min | 0.00% | A+ |
| SJU to RDU · Raleighthin sample | 40 | 87.5% | 51 min | 0.00% | A+ |
| SJU to DEN · Denverthin sample | 30 | 90.0% | 41 min | 0.00% | A+ |
| SJU to HPN · White Plainsthin sample | 30 | 82.8% | 73 min | 3.33% | B− |
| SJU to STT · Charlotte Amaliethin sample | 30 | 80.0% | 42 min | 0.00% | B+ |
| SJU to DCA · Washingtonthin sample | 30 | 86.7% | 114 min | 0.00% | A+ |
| SJU to STX · Christianstedthin sample | 30 | 80.0% | 43 min | 0.00% | B+ |
| SJU to DTW · Detroitthin sample | 30 | 89.7% | 41 min | 0.00% | A+ |
Delay causes
What held SJU up in April
One category carries most of the weight here. Late-arriving aircraft accounts for 48% of the 46,000 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.
- 48%Late-arriving aircraft
- 34%Carrier
- 18%National Airspace System
- 1%Extreme weather
48% 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 46,000 reported delay minutes here, that single category outweighs weather by 48 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 46,305 reported delay minutes.
Cancellations are rare at 0.75%, below the national 0.90% 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.
6.3% of arrivals land an hour or more late, close to the national 6.4%. 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 about an hour, which a normal layover absorbs.
What to do with this
Flying from SJU in April
For a April trip through SJU: expect 78.4% on time and 0.75% cancelled, going by April 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 March75.1%
- 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.