Carrier route record
B6PHL→SJU
JetBlue Airways · Philadelphia to San Juan
- Flights
- 159
- Period
- September 2025 to August 2026
- Share of route
- 8%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on PHL to SJU sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 159 flights. The strongest carrier on the route with a full sample, American Airlines, flew 763 at 71.4% on time.
The national on-time rate over the same period is 77.3%, so JetBlue on PHL to SJU runs 7 points behind the country as a whole. Across a thousand flights that is about 71 extra late arrivals.
Key figures
On time
70.2%
Arrivals under 15 minutes late, of 151 completed flights
Avg delay
94 min
Across delayed arrivals only, not all flights
Cancelled
4.40%
National rate is 1.89%
Whole route
63.3%
Every carrier on PHL to SJU, 1,992 flights
These figures cover 159 flights between September 2025 and August 2026. The median arrival is 2 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
JetBlue against every carrier on PHL to SJU
JetBlue flew 159 of the 1,992 flights on PHL to SJU, about 8% of it. Its 70.2% on time is 7 points better than the route as a whole, which runs 63.3%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from American at 71.4% to Frontier at 55.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. American Airlines arrives on time 71.4% of the time; Frontier Airlines manages 55.6%. Sample sizes sit next to every figure, because a two-point gap across 915 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| American Airlines | 763 | 71.4% | 77 min | 1.97% | C |
| JetBlue Airways (this page)thin sample | 159 | 70.2% | 94 min | 4.40% | C− |
| Spirit Airlinesthin sample | 155 | 61.9% | 67 min | 10.32% | D− |
| Frontier Airlines | 915 | 55.6% | 77 min | 3.17% | D− |
Frontier Airlines cancels 3.2% 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.
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Departure window
When JetBlue runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 159 flights.
There are not enough flights in each departure window to split JetBlue's PHL to SJU record by time of day without the percentages moving on noise. The headline rate of 70.2% is the reliable figure here.
Across the year
JetBlue on PHL to SJU through the year
- Jan–Mar 20266 flights—
- Apr–Jun 202691 flights78.9%
- Jul–Sep 202662 flights56.4%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 70.2% on time across 159 flights.
Split by quarter, JetBlue on PHL to SJU logged 6 flights in Jan–Mar 2026, 91 flights in Apr–Jun 2026 and 62 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 70.2% annual figure is the one to use.
Arrival by arrival
How late JetBlue on PHL to SJU runs when it is late
The 45 late arrivals split 16 under half an hour, 18 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early31 flights20.5%
- Within 15 min75 flights49.7%
- 15–29 min late16 flights10.6%
- 30–59 min late18 flights11.9%
- 1–2 hours late5 flights3.3%
- 2+ hours late6 flights4.0%
Scale runs 0% to 100%.
Share of 151 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 28 departures that left 15 minutes late or more, only 2 made it up before arrival. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SJU.
The worst days
Worst days for JetBlue on PHL to SJU
The latest arrival of the period was on 21 May 2026, 23 hours 17 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across May, August, July and June, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 May 2026 | 23 hours 17 minutes | Late-arriving aircraft |
| 27 May 2026 | 11 hours 10 minutes | National Airspace System |
| 27 August 2026 | 3 hours 36 minutes | Extreme weather |
| 6 July 2026 | 2 hours 36 minutes | National Airspace System |
| 20 June 2026 | 2 hours 6 minutes | Late-arriving aircraft |
Delay causes
Why JetBlue runs late on this route
Late-arriving aircraft accounts for 44% of the 4,221 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 40%National Airspace System
- 11%Carrier
- 5%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,221 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 4,221 reported delay minutes.
40% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,681 minutes out of 4,221, against a national NAS share of 21%.
Cancellations run at 4.40%, against 1.89% nationally. That is roughly one flight in 25 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.
Connections and stage length
What a delay here costs
7.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
At 1,576 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 90.7% on time across 159 flights, 21 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 21 points of difference.
One caution: this is a thin sample. 159 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking JetBlue on PHL to SJU
Put together: the delay figures matter less here than the 4.40% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 151 completed flights over 12 months sit behind that.
Related
Where to go next
- PHL to SJU, every carrier
- JetBlue on SJU to PHL, the return leg
- American Airlines on PHL to SJU71.4%
- Spirit Airlines on PHL to SJU61.9%
- Frontier Airlines on PHL to SJU55.6%
- JetBlue Airways network-wide record
- Philadelphia International (PHL) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
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.