Flight number record
B6 451
JetBlue Airways · Boston to Orlando
- Route
- BOS → MCO
- Departs
- 16:20
- Flights
- 357
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 451, check with JetBlue Airways.
B6 451 earns an F−, which is as low as this site's scale goes for a reason. Only 52.2% of flights arrive inside the 15-minute window, 25 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 357 flights, with a median arrival 13 minutes late.
The national on-time rate over the same period is 77.3%, so B6 451 runs 25 points behind the country as a whole. Across a thousand flights that is about 251 extra late arrivals.
Key figures
On time
52.2%
Arrivals under 15 minutes late, of 343 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.36%
National rate is 1.89%
1 hour+ late
20.7%
National rate is 8.3%
These figures cover 357 flights between September 2025 and August 2026. Beyond the headline rate, 20.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 451 flies
B6 451 flies BOS to MCO without a single fixed slot. Its most common scheduled departure was 16:20, used on 48 of 357 flights, with 16:50 (44 flights) next.
- Departs 16:2048 flights13.4%
- Departs 16:5044 flights12.3%
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 16:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 451 runs 20 points worse at 52.2%. 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 451 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 451 is 17 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 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 451thin sample | 357 | 52.2% | 84 min | 3.36% | F− |
| 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 451 quarter by quarter
B6 451 did not run the same all year. Its best quarter was Jan–Mar 2026 at 57.8% on time and its weakest Jul–Sep 2026 at 39.6%, a swing of 18 points on roughly 71 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 202530 flights53.3%
- Oct–Dec 202592 flights48.9%
- Jan–Mar 202689 flights57.8%
- Apr–Jun 202688 flights57.5%
- Jul–Sep 202658 flights39.6%
Scale runs 30% to 65%.
By weekday, B6 451 did best on Wednesday at 62.0% on time and worst on Sunday at 38.3%. Each day rests on about 51 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 451 runs when it is late
The 164 late arrivals split 39 under half an hour, 54 between 30 and 60 minutes, and 71 an hour or more.
- 15+ min early58 flights16.9%
- Within 15 min121 flights35.3%
- 15–29 min late39 flights11.4%
- 30–59 min late54 flights15.7%
- 1–2 hours late34 flights9.9%
- 2+ hours late37 flights10.8%
Scale runs 0% to 100%.
Share of 343 completed flights by arrival against schedule.
30 of 165 late departures made up the time and arrived on time, 18% of them. In the other direction, 29 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 451
The latest arrival of the period was on 25 February 2026, 8 hours 26 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 |
|---|---|---|
| 25 February 2026 | 8 hours 26 minutes | Late-arriving aircraft |
| 19 July 2026 | 6 hours 19 minutes | Late-arriving aircraft |
| 12 August 2026 | 5 hours 47 minutes | Late-arriving aircraft |
| 14 March 2026 | 5 hours 32 minutes | Late-arriving aircraft |
| 30 June 2026 | 5 hours 26 minutes | Late-arriving aircraft |
Delay causes
Why B6 451 runs late
Late-arriving aircraft accounts for 58% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Late-arriving aircraft
- 23%Carrier
- 17%National Airspace System
- 2%Extreme weather
- 0%Security
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 14,000 reported delay minutes here, that single category outweighs weather by 29 to one. The split is drawn from 13,711 delay minutes reported on B6 451.
Cancellations run at 3.36%, against 1.89% nationally. That is about one flight in 30 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
20.7% 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 357 flights under B6 451 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. 357 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 451
For a booking, the cancellation rate is the figure to plan around on B6 451: 3.36% of its 357 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
- Delta Air Lines 1513 on the same route65.8%
- JetBlue Airways 2251 on the same route71.8%
- JetBlue Airways 551 on the same route63.1%
- 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.