Flight number record
B6 2321
JetBlue Airways · Boston to West Palm Beach
- Route
- BOS → PBI
- Departs
- 15:39
- Flights
- 315
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 315 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so B6 2321 runs 10 points behind the country as a whole. Across a thousand flights that is about 101 extra late arrivals.
Key figures
On time
67.2%
Arrivals under 15 minutes late, of 302 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
3.81%
National rate is 1.89%
1 hour+ late
11.3%
National rate is 8.3%
These figures cover 315 flights between September 2025 and August 2026. Beyond the headline rate, 11.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 2321 flies
B6 2321 flies BOS to PBI without a single fixed slot. Its most common scheduled departure was 15:39, used on 51 of 315 flights, with 12:00 (49 flights) next.
- Departs 15:3951 flights16.2%
- Departs 12:0049 flights15.6%
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 15:39 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 2321 runs 5 points worse at 67.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
B6 2321 next to BOS to PBI
Every carrier on BOS to PBI combined arrived on time 65.6% of the time across 2,039 flights, so B6 2321 is 2 points ahead of it. JetBlue flew 1,503 flights on the same city pair under all its flight numbers, including this one, and those ran 64.5% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 2321thin sample | 315 | 67.2% | 58 min | 3.81% | C− |
| All JetBlue Airways on BOS–PBI | 1,503 | 64.5% | 69 min | 3.73% | D− |
| All carriers on BOS–PBI | 2,039 | 65.6% | 72 min | 3.48% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 2321 quarter by quarter
B6 2321 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 53.0%, a swing of 37 points on roughly 79 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 flights90.0%
- Oct–Dec 202588 flights79.1%
- Jan–Mar 202689 flights53.0%
- Apr–Jun 202677 flights63.6%
- Jul–Sep 202631 flights—
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, B6 2321 did best on Friday at 77.3% on time and worst on Sunday at 48.9%. Each day rests on about 45 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 2321 runs when it is late
B6 2321 often beats the schedule: 81 of 302 completed flights, 27%, arrived 15 minutes or more early. The 99 late arrivals split 41 under half an hour, 24 between 30 and 60 minutes, and 34 an hour or more.
- 15+ min early81 flights26.8%
- Within 15 min122 flights40.4%
- 15–29 min late41 flights13.6%
- 30–59 min late24 flights7.9%
- 1–2 hours late24 flights7.9%
- 2+ hours late10 flights3.3%
Scale runs 0% to 100%.
Share of 302 completed flights by arrival against schedule.
18 of 80 late departures made up the time and arrived on time, 23% of them. In the other direction, 37 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 PBI.
The worst days
Worst days for B6 2321
The latest arrival of the period was on 7 September 2025, 4 hours 44 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across September, March, December, January and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 September 2025 | 4 hours 44 minutes | Late-arriving aircraft |
| 4 March 2026 | 4 hours 6 minutes | Late-arriving aircraft |
| 5 December 2025 | 3 hours 50 minutes | Carrier |
| 28 January 2026 | 2 hours 51 minutes | Carrier |
| 20 July 2026 | 2 hours 41 minutes | National Airspace System |
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 5,707 reported delay minutes.
- 36%National Airspace System
- 33%Late-arriving aircraft
- 27%Carrier
- 4%Extreme weather
36% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,077 minutes out of 5,707, against a national NAS share of 21%. The split is drawn from 5,707 delay minutes reported on B6 2321.
Cancellations run at 3.81%, 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
11.3% 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 1,197 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.
Every one of the 315 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. 315 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: 3.81% of its 315 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 route60.4%
- Boston Logan International (BOS) delay statistics
- Palm Beach International (PBI) 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.