Flight number record
B6 2321
JetBlue Airways · Boston to West Palm Beach
- Route
- BOS → PBI
- Departs
- 12:00
- Flights
- 338
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s B6 2321, check with JetBlue Airways.
B6 2321 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 338 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.6%, so B6 2321 runs 11 points behind the country as a whole. Across a thousand flights that is about 111 extra late arrivals.
Key figures
On time
66.5%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
2.66%
National rate is 1.81%
1 hour+ late
13.1%
National rate is 8.1%
These figures cover 338 flights between July 2025 and June 2026. Beyond the headline rate, 13.1% 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.
Schedule
When B6 2321 flies
B6 2321 flies BOS to PBI without a single fixed slot. Its most common scheduled departure was 12:00, used on 49 of 338 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:0049 flights14.5%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 12:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 2321 runs 12 points worse at 66.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
B6 2321 next to BOS to PBI
Every carrier on BOS to PBI combined arrived on time 65.7% of the time across 2,183 flights, so B6 2321 is about level with it. JetBlue flew 1,583 flights on the same city pair under all its flight numbers, including this one, and those ran 64.0% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 2321thin sample | 338 | 66.5% | 61 min | 2.66% | C |
| All JetBlue Airways on BOS–PBI | 1,583 | 64.0% | 71 min | 3.28% | D− |
| All carriers on BOS–PBI | 2,183 | 65.7% | 72 min | 3.02% | C− |
| JetBlue Airways, whole network | 234,468 | 72.7% | 76 min | 2.56% | C |
Across the year
B6 2321 quarter by quarter
B6 2321 did not run the same all year. Its best quarter was Oct–Dec 2025 at 79.1% on time and its weakest Jan–Mar 2026 at 53.0%, a swing of 26 points on roughly 85 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 202584 flights69.5%
- Oct–Dec 202588 flights79.1%
- Jan–Mar 202689 flights53.0%
- Apr–Jun 202677 flights63.6%
Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, B6 2321 did best on Wednesday at 73.3% on time and worst on Sunday at 46.0%. Each day rests on about 48 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Delay causes
Why B6 2321 runs late
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 6,681 reported delay minutes.
- 35%National Airspace System
- 34%Late-arriving aircraft
- 27%Carrier
- 4%Extreme weather
34% 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 6,681 reported delay minutes here, that single category outweighs weather by 8 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 6,681 delay minutes reported on B6 2321.
Cancellations run at 2.66%, against 1.81% nationally. That is about one flight in 40 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.1% 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.
The 1,197 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 338 flights under B6 2321 in the data flew BOS to PBI. 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. 338 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 2321
For a booking, the cancellation rate is the figure to plan around on B6 2321: 2.66% of its 338 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to PBI, every carrier and departure
- PBI to BOS, the return direction
- Delta Air Lines 2160 on the same route62.5%
- JetBlue Airways 21 on the same route72.7%
- Boston Logan International (BOS) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.