Carrier route record
B6BDL→SJU
JetBlue Airways · Hartford to San Juan
- Flights
- 727
- 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 BDL to SJU draws a D. About one flight in three 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 4 minutes late.
The national on-time rate over the same period is 77.6%, so JetBlue on BDL to SJU runs 14 points behind the country as a whole. Across a thousand flights that is about 135 extra late arrivals.
Key figures
On time
64.1%
Arrivals under 15 minutes late, of 711 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.81%
Whole route
63.5%
Every carrier on BDL to SJU, 961 flights
These figures cover 727 flights between July 2025 and June 2026. Beyond the headline rate, 14.2% 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 BDL to SJU
JetBlue flew 727 of the 961 flights on BDL to SJU, most of the route. Its 64.1% on time is about level with the route as a whole at 63.5%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from JetBlue at 64.1% to Frontier at 61.5%. 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 | 64.1% | 90 min | 1.65% | D |
| Frontier Airlinesthin sample | 234 | 61.5% | 108 min | 2.56% | D |
Flight by flight
JetBlue flight numbers on BDL to SJU
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. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am45 flights81.4%
- 8am–11am291 flights71.1%
- 11am–2pm28 flights—
- 2pm–5pm44 flights65.1%
- 5pm–8pm155 flights50.3%
- 8pm–5am164 flights60.4%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 50.3% on time, against 81.4% 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 291 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 75.8% in July. 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 69.5% on time and Monday the weakest at 58.7%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 48% of the 23,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 48%Late-arriving aircraft
- 35%Carrier
- 16%National Airspace System
- 0%Extreme weather
48% 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 23,000 reported delay minutes here, that single category outweighs weather by 48 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 22,949 reported delay minutes.
The largest share of delay minutes, 35%, 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 8,064 of the 23,000 delay minutes reported here.
Cancellations sit at 1.65% against a national 1.81%, which is ordinary. Diversions add another 0.55%.
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. 14.2% 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 69.3% on time across 726 flights, 5 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 5 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 64.1% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.