Carrier route record
B6BDL→SJU
JetBlue Airways · Hartford to San Juan
- Flights
- 727
- Period
- September 2025 to August 2026
- Share of route
- 75%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on BDL to SJU draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 727 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so JetBlue on BDL to SJU runs 17 points behind the country as a whole. Across a thousand flights that is about 174 extra late arrivals.
Key figures
On time
59.9%
Arrivals under 15 minutes late, of 711 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
1.93%
National rate is 1.89%
Whole route
59.0%
Every carrier on BDL to SJU, 968 flights
These figures cover 727 flights between September 2025 and August 2026. Beyond the headline rate, 17.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
JetBlue against every carrier on BDL to SJU
JetBlue flew 727 of the 968 flights on BDL to SJU, most of the route. Its 59.9% on time is about level with the route as a whole at 59.0%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from JetBlue at 59.9% to Frontier at 56.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways (this page) | 727 | 59.9% | 89 min | 1.93% | D |
| Frontier Airlinesthin sample | 241 | 56.3% | 97 min | 2.07% | D |
Flight by flight
JetBlue flight numbers on BDL to SJU
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 31 points, against half a point between the best and worst carrier.
- 5am–8am40 flights81.6%
- 8am–11am234 flights67.2%
- 11am–2pm90 flights59.8%
- 2pm–5pm44 flights65.1%
- 5pm–8pm155 flights50.3%
- 8pm–5am164 flights52.1%
Scale runs 40% to 85%.
The 5pm–8pm window is where this operation falls apart: 50.3% on time, against 81.6% 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 8am–11am window is the busiest, with 234 flights scheduled in it.
Across the year
JetBlue on BDL to SJU through the year
February is the weak month at 38.0% on time, against 72.6% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. December was the busiest month here, with 77 flights.
Across the week, Friday is the strongest day at 66.3% on time and Sunday the weakest at 54.4%, a spread of 12 points.
Arrival by arrival
How late JetBlue on BDL to SJU runs when it is late
The 285 late arrivals split 73 under half an hour, 91 between 30 and 60 minutes, and 121 an hour or more.
- 15+ min early102 flights14.3%
- Within 15 min324 flights45.6%
- 15–29 min late73 flights10.3%
- 30–59 min late91 flights12.8%
- 1–2 hours late63 flights8.9%
- 2+ hours late58 flights8.2%
Scale runs 0% to 100%.
Share of 711 completed flights by arrival against schedule.
51 of 282 late departures made up the time and arrived on time, 18% of them. In the other direction, 54 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 BDL to SJU
The latest arrival of the period was on 13 June 2026, 18 hours 3 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 June 2026 | 18 hours 3 minutes | Carrier |
| 30 June 2026 | 17 hours 18 minutes | Carrier |
| 9 February 2026 | 7 hours 49 minutes | Late-arriving aircraft |
| 29 January 2026 | 7 hours 12 minutes | Late-arriving aircraft |
| 18 March 2026 | 6 hours 46 minutes | Late-arriving aircraft |
Delay causes
Why JetBlue runs late on this route
Late-arriving aircraft accounts for 46% of the 25,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 36%Carrier
- 18%National Airspace System
- 1%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 25,000 reported delay minutes here, that single category outweighs weather by 46 to one. The split is drawn from 25,346 reported delay minutes.
The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 9,041 of the 25,000 delay minutes reported here.
Cancellations sit at 1.93% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and stage length
What a delay here costs
17.0% 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.
At 1,666 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 69.4% on time across 726 flights, 10 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 10 points of difference.
One caution: this is a thin sample. 727 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 BDL to SJU
Put together: treat all of this as provisional. 727 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 59.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 711 completed flights over 12 months sit behind that.
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.