Carrier route record
B6SJU→BDL
JetBlue Airways · San Juan to Hartford
- Flights
- 726
- Period
- July 2025 to June 2026
- Share of route
- 76%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on SJU to BDL sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 726 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.6%, so JetBlue on SJU to BDL runs 8 points behind the country as a whole. Across a thousand flights that is about 83 extra late arrivals.
Key figures
On time
69.3%
Arrivals under 15 minutes late, of 710 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.93%
National rate is 1.81%
Whole route
70.9%
Every carrier on SJU to BDL, 961 flights
These figures cover 726 flights between July 2025 and June 2026. Beyond the headline rate, 10.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
JetBlue against every carrier on SJU to BDL
JetBlue flew 726 of the 961 flights on SJU to BDL, most of the route. Its 69.3% on time is 2 points worse than the route as a whole, which runs 70.9%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Frontier at 75.8% to JetBlue at 69.3%. 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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 235 | 75.8% | 53 min | 1.70% | B |
| JetBlue Airways (this page) | 726 | 69.3% | 78 min | 1.93% | C |
Flight by flight
JetBlue flight numbers on SJU to BDL
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 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am307 flights77.2%
- 8am–11am—
- 11am–2pm59 flights66.1%
- 2pm–5pm186 flights59.9%
- 5pm–8pm172 flights66.9%
- 8pm–5am2 flights—
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 77.2% of the time, against 59.9% for the afternoon window. That is 17 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 307 flights scheduled in it.
Across the year
JetBlue on SJU to BDL through the year
May is the best month on the calendar at 86.9% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. December was the busiest month here, with 76 flights.
Across the week, Wednesday is the strongest day at 79.6% on time and Saturday the weakest at 61.8%. 18 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 17,000 reported delay minutes.
- 41%Carrier
- 38%Late-arriving aircraft
- 20%National Airspace System
- 1%Extreme weather
38% 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 17,000 reported delay minutes here, that single category outweighs weather by 33 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 17,044 reported delay minutes.
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 6,962 of the 17,000 delay minutes reported here.
Cancellations sit at 1.93% against a national 1.81%, which is ordinary. Diversions add another 0.28%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 64.1% on time across 727 flights, 5 points below 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 5 points of difference.
One caution: this is a thin sample. 726 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 SJU to BDL
Put together: treat all of this as provisional. 726 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 69.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 710 completed flights over 12 months sit behind that.
Related
Where to go next
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.