Flight number record
B6 553
JetBlue Airways · Fort Lauderdale to San Juan
- Route
- FLL → SJU
- Departs
- 17:45
- Flights
- 304
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 553, check with JetBlue Airways.
B6 553 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 304 flights, with a median arrival 8 minutes early.
Set against the rest of the country, B6 553's record is 6 points better than the US average of 77.3%. That gap is worth roughly 60 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 299 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 304 flights between September 2025 and August 2026. The median arrival is 8 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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Schedule
When B6 553 flies
B6 553 flies FLL to SJU without a single fixed slot. Its most common scheduled departure was 17:45, used on 49 of 304 flights, with 06:00 (42 flights) and 06:40 (37 flights) next.
- Departs 17:4549 flights16.1%
- Departs 06:0042 flights13.8%
- Departs 06:4037 flights12.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and B6 553 runs 15 points better at 83.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
B6 553 next to FLL to SJU
Every carrier on FLL to SJU combined arrived on time 66.8% of the time across 2,358 flights, so B6 553 is 17 points ahead of it. JetBlue flew 1,718 flights on the same city pair under all its flight numbers, including this one, and those ran 69.3% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 553thin sample | 304 | 83.3% | 58 min | 1.64% | B |
| All JetBlue Airways on FLL–SJU | 1,718 | 69.3% | 60 min | 1.57% | C |
| All carriers on FLL–SJU | 2,358 | 66.8% | 63 min | 1.57% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 553 quarter by quarter
B6 553 did not run the same all year. Its best quarter was Oct–Dec 2025 at 92.2% on time and its weakest Jul–Sep 2026 at 68.9%, a swing of 23 points on roughly 76 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 20252 flights—
- Oct–Dec 202565 flights92.2%
- Jan–Mar 202688 flights89.5%
- Apr–Jun 202687 flights80.2%
- Jul–Sep 202662 flights68.9%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, B6 553 did best on Thursday at 88.6% on time and worst on Monday at 76.1%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 553 runs when it is late
B6 553 often beats the schedule: 81 of 299 completed flights, 27%, arrived 15 minutes or more early. The 50 late arrivals split 24 under half an hour, 12 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early81 flights27.1%
- Within 15 min168 flights56.2%
- 15–29 min late24 flights8.0%
- 30–59 min late12 flights4.0%
- 1–2 hours late8 flights2.7%
- 2+ hours late6 flights2.0%
Scale runs 0% to 100%.
Share of 299 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 52 departures that left 15 minutes late or more, only 6 made it up before arrival. Only 4 left on time and still arrived late.
The worst days
Worst days for B6 553
The latest arrival of the period was on 3 August 2026, 4 hours 54 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 August 2026 | 4 hours 54 minutes | Late-arriving aircraft |
| 25 June 2026 | 3 hours 58 minutes | Late-arriving aircraft |
| 20 July 2026 | 3 hours 15 minutes | Carrier |
| 9 August 2026 | 2 hours 46 minutes | Late-arriving aircraft |
| 10 July 2026 | 2 hours 44 minutes | Late-arriving aircraft |
Delay causes
Why B6 553 runs late
Late-arriving aircraft accounts for 58% of the 2,903 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Late-arriving aircraft
- 27%Carrier
- 9%National Airspace System
- 6%Extreme weather
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,903 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 2,903 delay minutes reported on B6 553.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,046 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 304 flights under B6 553 in the data flew FLL to SJU. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 304 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 B6 553
For a booking, read B6 553 as 83.3% on time with 1.64% cancelled over 304 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- FLL to SJU, every carrier and departure
- SJU to FLL, the return direction
- JetBlue Airways 1553 on the same route58.9%
- JetBlue Airways 1453 on the same route70.4%
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- JetBlue Airways on-time record
- Every JetBlue Airways flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means JetBlue Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.