Flight number record
B6 551
JetBlue Airways · Boston to Orlando
- Route
- BOS → MCO
- Departs
- 14:15
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 551, check with JetBlue Airways.
B6 551 draws a D−. Roughly 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 265 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.3%, so B6 551 runs 14 points behind the country as a whole. Across a thousand flights that is about 142 extra late arrivals.
Key figures
On time
63.1%
Arrivals under 15 minutes late, of 249 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.77%
National rate is 1.89%
1 hour+ late
18.1%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 18.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 551 flies
B6 551 flies BOS to MCO without a single fixed slot. Its most common scheduled departure was 14:15, used on 32 of 265 flights.
- Departs 14:1532 flights12.1%
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 14:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 551 runs 9 points worse at 63.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
B6 551 next to BOS to MCO
Every carrier on BOS to MCO combined arrived on time 69.5% of the time across 4,605 flights, so B6 551 is 6 points behind it. JetBlue flew 2,520 flights on the same city pair under all its flight numbers, including this one, and those ran 66.6% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 551thin sample | 265 | 63.1% | 84 min | 3.77% | D− |
| All JetBlue Airways on BOS–MCO | 2,520 | 66.6% | 74 min | 3.61% | C− |
| All carriers on BOS–MCO | 4,605 | 69.5% | 77 min | 3.17% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 551 quarter by quarter
B6 551 did not run the same all year. Its best quarter was Jan–Mar 2026 at 71.1% on time and its weakest Jul–Sep 2026 at 47.4%, a swing of 24 points on roughly 66 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.
- Oct–Dec 202567 flights69.2%
- Jan–Mar 202690 flights71.1%
- Apr–Jun 202664 flights55.6%
- Jul–Sep 202644 flights47.4%
Scale runs 40% to 75%.
By weekday, B6 551 did best on Wednesday at 75.7% on time and worst on Sunday at 42.9%. Each day rests on about 38 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 551 runs when it is late
The 92 late arrivals split 21 under half an hour, 26 between 30 and 60 minutes, and 45 an hour or more.
- 15+ min early48 flights19.3%
- Within 15 min109 flights43.8%
- 15–29 min late21 flights8.4%
- 30–59 min late26 flights10.4%
- 1–2 hours late20 flights8.0%
- 2+ hours late25 flights10.0%
Scale runs 0% to 100%.
Share of 249 completed flights by arrival against schedule.
14 of 88 late departures made up the time and arrived on time, 16% of them. In the other direction, 18 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 MCO.
The worst days
Worst days for B6 551
The latest arrival of the period was on 5 August 2026, 5 hours 20 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 August 2026 | 5 hours 20 minutes | Late-arriving aircraft |
| 5 April 2026 | 5 hours | Late-arriving aircraft |
| 22 July 2026 | 4 hours 33 minutes | Late-arriving aircraft |
| 2 August 2026 | 4 hours 20 minutes | Late-arriving aircraft |
| 22 February 2026 | 3 hours 52 minutes | Late-arriving aircraft |
Delay causes
Why B6 551 runs late
Late-arriving aircraft accounts for 56% of the 7,713 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Late-arriving aircraft
- 25%National Airspace System
- 18%Carrier
56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,713 reported delay minutes here, that single category outweighs weather by 56 to one. The split is drawn from 7,713 delay minutes reported on B6 551.
Cancellations run at 3.77%, against 1.89% nationally. That is about 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 routes
What a delay on this flight costs
18.1% 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.
The 1,121 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 265 flights under B6 551 in the data flew BOS to MCO. 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. 265 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 551
For a booking, the cancellation rate is the figure to plan around on B6 551: 3.77% of its 265 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to MCO, every carrier and departure
- MCO to BOS, the return direction
- JetBlue Airways 451 on the same route52.2%
- Delta Air Lines 1513 on the same route65.8%
- JetBlue Airways 2251 on the same route71.8%
- Delta Air Lines 1580 on the same route90.7%
- Boston Logan International (BOS) delay statistics
- Orlando International (MCO) 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.