Route profile
SJU→JFK
Flight reliability, delays and best times to fly from San Juan to New York, 1,598 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 32% of comparable major US routes (4,598 compared)
Calculated from 11,345 flights. How this is calculated
SJU → JFK arrives on time 79.0% of the time; the return trip, JFK → SJU, arrives on time 70.5% of the time, an 8.5-point gap between the two directions of the same city pair.
SJU → JFK spends 25.8 minutes on the ground on a 1,598-mile trip: 14.7 minutes from pushback to wheels-up at SJU and 11.1 minutes from touchdown to gate at JFK.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Every day of the week performs about the same on this route, steadier than 97% of 4,467 comparable routes.
81.0% on time on the best day (Wednesday) against 77.3% on the worst (Sunday).
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,467 in the comparison.
Why SJU → JFK flights are cancelled
July 2023 – July 2026
SJU → JFK cancelled 204 of 11,345 scheduled flights — about 1 in every 56. The reason filed most often was extreme weather, 36.3% of the cancellations coded on this route — about 1 in every 153 scheduled flights.
Share of cancellations
Of 204 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
74 cancellations, 36.3% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
66 cancellations, 32.4% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
59 cancellations, 28.9% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
5 cancellations, 2.5% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
204 coded cancellations were recorded on SJU → JFK; the section appears from 50.
When it goes wrong
July 2023 – July 2026
50 min late
against a median of 9 min early
Percentiles over 11,345 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at JFK after arriving from SJU.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 34% | Likely to miss |
| 45 min | 20% | High risk |
| 60 min | 14% | Some risk |
| 90 min | 8.6% | Some risk |
| 120 min | 5.7% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.80% of the time and diverts 0.21% of the time, which a late arrival never shows up in.
Chance of missing is the share of 11,117 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 50 minutes late (90th-percentile gate arrival delay), over 11,345 operations.
Any other layover length: connection checker.
Best time to fly
SJU → JFK flights departing 5–9 AM arrived on time 87.3% of the time, against 70.7% for 6–9 PM departures, a gap of 16.6 percentage points.
By departure window
By departure hour
- 12 AM to 2 AM: too few flights to score
- 3 AM: 86.3% on time from 322 flights
- 4 AM: 80.2% on time from 249 flights
- 5 AM: 79.3% on time from 523 flights
- 6 AM: 84.7% on time from 965 flights
- 7 AM: 91.8% on time from 1,547 flights
- 8 AM: 86.1% on time from 503 flights
- 9 AM: 84.8% on time from 316 flights
- 10 AM: 75.1% on time from 346 flights
- 11 AM: 78.7% on time from 395 flights
- 12 PM: 77.7% on time from 407 flights
- 1 PM: 80.0% on time from 1,219 flights
- 2 PM: 74.8% on time from 839 flights
- 3 PM: 66.8% on time from 198 flights
- 4 PM: 72.4% on time from 158 flights
- 5 PM: 81.0% on time from 698 flights
- 6 PM: 75.1% on time from 1,281 flights
- 7 PM: 68.1% on time from 276 flights
- 8 PM: 52.0% on time from 264 flights
- 9 PM: 65.5% on time from 567 flights
- 10 PM to 11 PM: too few flights to score
Why SJU → JFK runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for SJU → JFK. Only delays of 15 minutes or more are attributed.
How this route holds up in bad weather
July 2023 – July 2026
The harder-hit end is JFK, where the flight lands. Its figure counts departures from JFK, so it says more about how that airport copes than about this route. Bad weather cancels 3.5 times the normal rate at JFK against barely any change at SJU. Cancelled in bad weather against normal hours: SJU 1.5% against 1.4%, JFK 6.0% against 1.7%. Flights that did leave JFK in bad weather arrived on time 64.1% of the time, against 79.7% in normal hours.
Bad weather and normal hours at the airports
Scheduled departures, July 2023 – July 2026| Departures from | SJU | JFK |
|---|---|---|
| Cancelled in bad weather | 1.5% | 6.0% |
| Cancelled in normal hours | 1.4% | 1.7% |
| Arrived on time, bad weather | 69.5% | 64.1% |
| Arrived on time, normal hours | 76.4% | 79.7% |
| Departures in bad weather | 2,333 | 46,497 |
These are airport figures, not route figures: every scheduled departure from SJU and JFK, to any destination, in hours the weather report called bad.
Weather source and limits. In full: SJU, JFK, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| JetBlue | 6,850 | 75.2% | 2.28% | -7 min | 11.1% |
| Delta Air Lines | 3,402 | 88.5% | 0.97% | -13 min | 3.9% |
| Frontier Airlines | 1,093 | 73.4% | 1.37% | -4 min | 9.8% |
JetBlue flew 60.4% of the 11,345 flights listed. JetBlue cancelled 2.28% of its flights here against 0.97% for Delta Air Lines.
Delta Air Lines arrived on time 15.1 percentage points more often than Frontier Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
DL1854 (7:00 AM) arrived on time 93.9% of the time, 28.2 points more often than B62404 (1:52 PM) at 65.7%.
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Sunday the least, a gap of 3.7 percentage points.
By month
- Jan: 77.1%
- Feb: 79.3%
- Mar: 77.2%
- Apr: 85.1%
- May: 87.3%
- Jun: 82.3%
- Jul: 67.7%
- Aug: 71.7%
- Sep: 82.0%
- Oct: 84.1%
- Nov: 82.1%
- Dec: 79.4%
July is historically the weakest month and May the strongest, a spread of 19.6 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 64.8% from 297 flights
- August 2023: 68.3% from 297 flights
- September 2023: 70.9% from 207 flights
- October 2023: 77.5% from 215 flights
- November 2023: 81.8% from 258 flights
- December 2023: 83.2% from 281 flights
- January 2024: 81.4% from 265 flights
- February 2024: 76.8% from 239 flights
- March 2024: 72.0% from 272 flights
- April 2024: 84.0% from 296 flights
- May 2024: 88.8% from 278 flights
- June 2024: 79.6% from 333 flights
- July 2024: 73.9% from 366 flights
- August 2024: 72.7% from 371 flights
- September 2024: 88.6% from 272 flights
- October 2024: 89.7% from 302 flights
- November 2024: 83.5% from 346 flights
- December 2024: 77.7% from 384 flights
- January 2025: 76.5% from 336 flights
- February 2025: 87.6% from 317 flights
- March 2025: 76.1% from 391 flights
- April 2025: 86.7% from 370 flights
- May 2025: 85.0% from 335 flights
- June 2025: 83.5% from 350 flights
- July 2025: 71.6% from 371 flights
- August 2025: 73.4% from 359 flights
- September 2025: 83.9% from 248 flights
- October 2025: 83.0% from 269 flights
- November 2025: 80.6% from 297 flights
- December 2025: 78.1% from 351 flights
- January 2026: 73.7% from 310 flights
- February 2026: 71.6% from 294 flights
- March 2026: 83.1% from 305 flights
- April 2026: 84.1% from 310 flights
- May 2026: 88.5% from 254 flights
- June 2026: 83.9% from 289 flights
- July 2026: 57.7% from 310 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 78.1% against 81.2% in the 12 months before — declining by 3.1 percentage points.
Data and methodology
Calculated by FlyerIntel from 11,345 SJU → JFK flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed