Flight number record
B6 333
JetBlue Airways · Boston to San Francisco
- Route
- BOS → SFO
- Departs
- 16:40
- Flights
- 270
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 333, check with JetBlue Airways.
B6 333 earns an F, which is as low as this site's scale goes for a reason. Only 54.3% of flights arrive inside the 15-minute window, 23 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 270 flights, with a median arrival 12 minutes late.
The national on-time rate over the same period is 77.3%, so B6 333 runs 23 points behind the country as a whole. Across a thousand flights that is about 230 extra late arrivals.
Key figures
On time
54.3%
Arrivals under 15 minutes late, of 265 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
1.85%
National rate is 1.89%
1 hour+ late
17.7%
National rate is 8.3%
These figures cover 270 flights between September 2025 and August 2026. Beyond the headline rate, 17.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 333 flies
B6 333 flies BOS to SFO without a single fixed slot. Its most common scheduled departure was 16:40, used on 38 of 270 flights, with 15:45 (33 flights) and 15:05 (32 flights) next.
- Departs 16:4038 flights14.1%
- Departs 15:4533 flights12.2%
- Departs 15:0532 flights11.9%
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 16:40 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 333 runs 18 points worse at 54.3%. 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 333 next to BOS to SFO
Every carrier on BOS to SFO combined arrived on time 69.2% of the time across 4,817 flights, so B6 333 is 15 points behind it. JetBlue flew 1,808 flights on the same city pair under all its flight numbers, including this one, and those ran 66.5% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 333thin sample | 270 | 54.3% | 70 min | 1.85% | F |
| All JetBlue Airways on BOS–SFO | 1,808 | 66.5% | 67 min | 2.05% | C |
| All carriers on BOS–SFO | 4,817 | 69.2% | 66 min | 1.58% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 333 quarter by quarter
Quarter by quarter B6 333 held fairly steady: 50.0% in Oct–Dec 2025, 56.8% in Jan–Mar 2026 and 50.6% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202522 flights—
- Oct–Dec 202582 flights50.0%
- Jan–Mar 202677 flights56.8%
- Apr–Jun 202689 flights50.6%
Scale runs 40% to 60%. Rows with fewer than 30 flights show a dash.
By weekday, B6 333 did best on Wednesday at 64.1% on time and worst on Friday at 39.5%. Each day rests on about 39 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 333 runs when it is late
The 121 late arrivals split 39 under half an hour, 35 between 30 and 60 minutes, and 47 an hour or more.
- 15+ min early54 flights20.4%
- Within 15 min90 flights34.0%
- 15–29 min late39 flights14.7%
- 30–59 min late35 flights13.2%
- 1–2 hours late29 flights10.9%
- 2+ hours late18 flights6.8%
Scale runs 0% to 100%.
Share of 265 completed flights by arrival against schedule.
19 of 102 late departures made up the time and arrived on time, 19% of them. In the other direction, 38 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 SFO.
The worst days
Worst days for B6 333
The latest arrival of the period was on 27 February 2026, 5 hours 37 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 |
|---|---|---|
| 27 February 2026 | 5 hours 37 minutes | Late-arriving aircraft |
| 25 September 2025 | 5 hours 5 minutes | Late-arriving aircraft |
| 18 December 2025 | 4 hours 57 minutes | Late-arriving aircraft |
| 19 October 2025 | 4 hours 50 minutes | Late-arriving aircraft |
| 28 December 2025 | 4 hours 16 minutes | Late-arriving aircraft |
Delay causes
Why B6 333 runs late
Late-arriving aircraft accounts for 54% of the 8,468 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 29%National Airspace System
- 15%Carrier
- 2%Extreme weather
- 0%Security
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,468 reported delay minutes here, that single category outweighs weather by 29 to one. The split is drawn from 8,468 delay minutes reported on B6 333.
Cancellations sit at 1.85% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
17.7% 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.
At 2,704 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 270 flights under B6 333 in the data flew BOS to SFO. 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. 270 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 333
For a booking, B6 333 is a flight to put a long connection behind. 17.7% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- BOS to SFO, every carrier and departure
- SFO to BOS, the return direction
- Delta Air Lines 1655 on the same route66.1%
- JetBlue Airways 733 on the same route55.9%
- United Airlines 2400 on the same route51.1%
- United Airlines 2441 on the same route84.4%
- United Airlines 1074 on the same route77.8%
- Boston Logan International (BOS) delay statistics
- San Francisco International (SFO) 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.