Flight number record
B6 591
JetBlue Airways · Boston to Tampa
- Route
- BOS → TPA
- Departs
- 15:45
- Flights
- 294
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 591, check with JetBlue Airways.
B6 591 draws a D−. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 294 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so B6 591 runs 18 points behind the country as a whole. Across a thousand flights that is about 179 extra late arrivals.
Key figures
On time
59.4%
Arrivals under 15 minutes late, of 276 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
5.78%
National rate is 1.89%
1 hour+ late
17.0%
National rate is 8.3%
These figures cover 294 flights between September 2025 and August 2026. Beyond the headline rate, 17.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 591 flies
B6 591 flies BOS to TPA without a single fixed slot. Its most common scheduled departure was 15:45, used on 32 of 294 flights, with 18:15 (32 flights) next.
- Departs 15:4532 flights10.9%
- Departs 18:1532 flights10.9%
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 15:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 591 runs 13 points worse at 59.4%. 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 591 next to BOS to TPA
Every carrier on BOS to TPA combined arrived on time 74.4% of the time across 2,780 flights, so B6 591 is 15 points behind it. JetBlue flew 1,588 flights on the same city pair under all its flight numbers, including this one, and those ran 73.1% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 591thin sample | 294 | 59.4% | 71 min | 5.78% | D− |
| All JetBlue Airways on BOS–TPA | 1,588 | 73.1% | 68 min | 3.90% | C− |
| All carriers on BOS–TPA | 2,780 | 74.4% | 70 min | 3.13% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 591 quarter by quarter
B6 591 did not run the same all year. Its best quarter was Oct–Dec 2025 at 66.0% on time and its weakest Jul–Sep 2026 at 40.4%, a swing of 26 points on roughly 74 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 202528 flights—
- Oct–Dec 202551 flights66.0%
- Jan–Mar 202669 flights65.6%
- Apr–Jun 202684 flights60.2%
- Jul–Sep 202662 flights40.4%
Scale runs 30% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, B6 591 did best on Wednesday at 70.3% on time and worst on Thursday at 52.4%. Each day rests on about 42 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 591 runs when it is late
The 112 late arrivals split 26 under half an hour, 39 between 30 and 60 minutes, and 47 an hour or more.
- 15+ min early67 flights24.3%
- Within 15 min97 flights35.1%
- 15–29 min late26 flights9.4%
- 30–59 min late39 flights14.1%
- 1–2 hours late26 flights9.4%
- 2+ hours late21 flights7.6%
Scale runs 0% to 100%.
Share of 276 completed flights by arrival against schedule.
26 of 125 late departures made up the time and arrived on time, 21% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for B6 591
The latest arrival of the period was on 21 February 2026, 4 hours 10 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 February 2026 | 4 hours 10 minutes | Late-arriving aircraft |
| 28 August 2026 | 4 hours 3 minutes | Carrier |
| 18 January 2026 | 4 hours 2 minutes | Late-arriving aircraft |
| 24 April 2026 | 3 hours 36 minutes | Late-arriving aircraft |
| 5 July 2026 | 3 hours 28 minutes | National Airspace System |
Delay causes
Why B6 591 runs late
Late-arriving aircraft accounts for 62% of the 7,894 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Late-arriving aircraft
- 24%Carrier
- 13%National Airspace System
- 0%Extreme weather
62% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,894 reported delay minutes here, that single category outweighs weather by 62 to one. The split is drawn from 7,894 delay minutes reported on B6 591.
Cancellations run at 5.78%, against 1.89% nationally. That is roughly one flight in fifteen 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
17.0% 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 1,185 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 294 flights under B6 591 in the data flew BOS to TPA. 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. 294 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 591
For a booking, the cancellation rate is the figure to plan around on B6 591: 5.78% of its 294 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to TPA, every carrier and departure
- TPA to BOS, the return direction
- Delta Air Lines 1439 on the same route71.6%
- JetBlue Airways 391 on the same route59.1%
- JetBlue Airways 891 on the same route90.3%
- Delta Air Lines 2234 on the same route63.4%
- Boston Logan International (BOS) delay statistics
- Tampa International (TPA) 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.