Carrier performance at one airport
B6→SJU
JetBlue Airways at Luis Munoz Marin International
- Departures
- 12,134
- Period
- September 2025 to August 2026
- Routes
- 18
- Rank here
- #5 of 7
JetBlue Airways at San Juan sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 12,134 flights, of which Delta Air Lines flew 3,626 at 87.5% on time.
Measured against the airport rather than the country, JetBlue Airways runs 4 points behind the 77.7% weighted average across all carriers at SJU. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
73.9%
11,773 completed departures
Avg delay
77 min
Across delayed flights only
Cancelled
2.60%
At SJU, this carrier only
Rank here
#5
Of 7 carriers clearing the floor at SJU
These figures cover 12,000 flights between September 2025 and August 2026. Beyond the headline rate, 10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Against the competition
Every carrier at SJU, ranked
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.5% of the time; Spirit Airlines manages 69.5%. Sample sizes sit next to every figure, because a two-point gap across 2,066 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 3,626 | 87.5% | 70 min | 1.63% | A |
| United Airlines | 3,596 | 84.5% | 73 min | 1.22% | B |
| American Airlines | 5,024 | 81.4% | 95 min | 1.43% | B |
| Southwest Airlines | 3,888 | 79.0% | 46 min | 0.80% | B+ |
| JetBlue Airways (this page) | 12,134 | 73.9% | 77 min | 2.60% | C |
| Frontier Airlines | 4,998 | 73.4% | 90 min | 2.34% | C |
| Spirit Airlines | 2,066 | 69.5% | 78 min | 5.23% | C− |
Spirit Airlines cancels 5.2% 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
Where JetBlue Airways flies from SJU
JetBlue Airways operates 18 routes out of SJU with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SJU to JFK · New York | 2,250 | 72.4% | 85 min | 4.84% | C− |
| SJU to MCO · Orlando | 2,194 | 74.8% | 76 min | 1.55% | C |
| SJU to FLL · Fort Lauderdale | 1,717 | 77.9% | 73 min | 1.34% | B |
| SJU to BOS · Boston | 1,342 | 68.5% | 77 min | 3.58% | C− |
| SJU to BDL · Hartford | 726 | 69.4% | 75 min | 2.62% | C |
| SJU to EWR · Newark | 685 | 71.3% | 73 min | 3.07% | C− |
| SJU to TPA · Tampa | 680 | 77.1% | 72 min | 1.47% | B |
| SJU to DCA · Washingtonthin sample | 364 | 69.7% | 100 min | 1.92% | C |
| SJU to HPN · White Plainsthin sample | 359 | 70.7% | 93 min | 5.01% | C− |
| SJU to STT · Charlotte Amaliethin sample | 351 | 70.5% | 65 min | 0.28% | C+ |
| SJU to RDU · Raleighthin sample | 333 | 83.7% | 71 min | 1.50% | B |
| SJU to STX · Christianstedthin sample | 308 | 74.2% | 49 min | 0.65% | C+ |
| SJU to PVD · Providencethin sample | 268 | 71.0% | 64 min | 1.87% | C |
| SJU to PHL · Philadelphiathin sample | 159 | 90.7% | 65 min | 4.40% | A− |
| SJU to JAX · Jacksonvillethin sample | 148 | 75.7% | 68 min | 2.03% | B |
| SJU to BUF · Buffalothin sample | 91 | 81.1% | 130 min | 1.10% | B |
| SJU to ORF · Norfolkthin sample | 91 | 88.9% | 99 min | 1.10% | A |
| SJU to RIC · Richmondthin sample | 68 | 81.8% | 85 min | 1.47% | B |
Flight by flight
JetBlue Airways flight numbers from SJU
14 JetBlue Airways flight numbers leaving SJU flew their main route often enough to have a record of their own. Grouped by destination.
- B6 1476to BDL 06:0176.3%
- B6 862to BOS 13:0069.8%
- B6 1348to DCA 18:0569.7%
- B6 754to FLL 07:0088.1%
- B6 1454to FLL 17:2569.7%
- B6 2602to HPN 17:4470.7%
- B6 904to JFK 13:2577.7%
- B6 1004to JFK 15:2464.2%
- B6 1604to JFK 14:2579.9%
- B6 1134to MCO 17:3569.1%
- B6 1334to MCO 20:3070.2%
- B6 1434to MCO 05:0179.2%
- B6 526to PVD 17:1571.0%
- B6 2752to TPA 06:0184.6%
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 points, against 18 points between the best and worst carrier.
- 5am–8am2,583 flights87.3%
- 8am–11am1,096 flights84.5%
- 11am–2pm1,916 flights75.1%
- 2pm–5pm2,306 flights66.1%
- 5pm–8pm2,655 flights67.5%
- 8pm–5am1,578 flights65.0%
Scale runs 55% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.3% of the time, against 65.0% for the overnight window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 2,655 flights scheduled in it.
Across the year
Seasonal pattern
July is the worst month at 63.6% on time, 22 points below May, the best at 85.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 1,278 flights.
Delay causes
What holds this operation up
- 52%Late-arriving aircraft
- 37%Carrier
- 10%National Airspace System
- 0%Extreme weather
- 0%Security
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 237,000 reported delay minutes here, that single category outweighs weather by 52 to one. The split is drawn from 237,128 reported delay minutes.
Cancellations run at 2.60%, against 1.89% nationally. That is about one flight in 40 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.
10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
12,134 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 85.5% on time and July 63.6%, a swing of 22 points. If the dates move at all, move them out of July before you think about anything else. 11,773 completed flights over 12 months sit behind that.
Common questions
JetBlue Airways at SJU
How often is JetBlue Airways at SJU delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 26.1% of the 12,134 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on JetBlue Airways at SJU?
Delta Air Lines leads at 87.5% on time across 3,626 flights. Spirit Airlines is at the other end on 69.5%, a gap of 18 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on JetBlue Airways at SJU?
The 5am–8am departure window is the strongest at 87.3% on time. The 8pm–5am window is the weakest at 65.0%, 22 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on JetBlue Airways at SJU?
July is the weakest month at 63.6% on time, compared with 85.5% in May. Across the year that is 22 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.