Flight number record
B6 811
JetBlue Airways · Boston to Chicago
- Route
- BOS → ORD
- Departs
- 15:35
- Flights
- 264
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 811, check with JetBlue Airways.
B6 811 earns an F−, which is as low as this site's scale goes for a reason. Only 52.8% 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 264 flights, with a median arrival 11 minutes late.
The national on-time rate over the same period is 77.3%, so B6 811 runs 25 points behind the country as a whole. Across a thousand flights that is about 245 extra late arrivals.
Key figures
On time
52.8%
Arrivals under 15 minutes late, of 252 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
4.55%
National rate is 1.89%
1 hour+ late
24.6%
National rate is 8.3%
These figures cover 264 flights between September 2025 and August 2026. Beyond the headline rate, 24.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 811 flies
B6 811 flies BOS to ORD without a single fixed slot. Its most common scheduled departure was 15:35, used on 35 of 264 flights.
- Departs 15:3535 flights13.3%
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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 811 runs 19 points worse at 52.8%. 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 811 next to BOS to ORD
Every carrier on BOS to ORD combined arrived on time 71.9% of the time across 7,860 flights, so B6 811 is 19 points behind it. JetBlue flew 552 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 811thin sample | 264 | 52.8% | 84 min | 4.55% | F− |
| All JetBlue Airways on BOS–ORD | 552 | 66.6% | 80 min | 3.26% | C− |
| All carriers on BOS–ORD | 7,860 | 71.9% | 87 min | 2.98% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 811 quarter by quarter
B6 811 did not run the same all year. Its best quarter was Oct–Dec 2025 at 65.3% on time and its weakest Jul–Sep 2026 at 21.3%, a swing of 44 points on roughly 66 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 202518 flights—
- Oct–Dec 202574 flights65.3%
- Jan–Mar 202654 flights64.7%
- Apr–Jun 202665 flights51.6%
- Jul–Sep 202653 flights21.3%
Scale runs 15% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, B6 811 did best on Wednesday at 56.2% on time and worst on Friday at 39.1%. Each day rests on about 38 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 811 runs when it is late
When B6 811 is late it tends to be very late: 62 of its 119 late arrivals were an hour or more behind, and 28 were two hours or more.
- 15+ min early56 flights22.2%
- Within 15 min77 flights30.6%
- 15–29 min late25 flights9.9%
- 30–59 min late32 flights12.7%
- 1–2 hours late34 flights13.5%
- 2+ hours late28 flights11.1%
Scale runs 0% to 100%.
Share of 252 completed flights by arrival against schedule.
17 of 118 late departures made up the time and arrived on time, 14% of them. In the other direction, 18 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 ORD.
The worst days
Worst days for B6 811
The latest arrival of the period was on 31 August 2026, 5 hours 13 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 August 2026 | 5 hours 13 minutes | National Airspace System |
| 7 February 2026 | 4 hours 54 minutes | Extreme weather |
| 17 April 2026 | 4 hours 38 minutes | Late-arriving aircraft |
| 15 July 2026 | 4 hours 24 minutes | National Airspace System |
| 4 May 2026 | 4 hours 12 minutes | National Airspace System |
Delay causes
Why B6 811 runs late
National Airspace System accounts for 45% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%National Airspace System
- 34%Late-arriving aircraft
- 18%Carrier
- 3%Extreme weather
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 10,000 reported delay minutes here, that single category outweighs weather by 13 to one. The split is drawn from 10,037 delay minutes reported on B6 811.
Cancellations run at 4.55%, against 1.89% nationally. That is roughly one flight in twenty 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
24.6% 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 867 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 264 flights under B6 811 in the data flew BOS to ORD. 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. 264 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 811
For a booking, the cancellation rate is the figure to plan around on B6 811: 4.55% of its 264 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 ORD, every carrier and departure
- ORD to BOS, the return direction
- United Airlines 2040 on the same route53.1%
- United Airlines 1414 on the same route93.6%
- United Airlines 1732 on the same route83.8%
- United Airlines 1349 on the same route86.0%
- United Airlines 1015 on the same route50.3%
- JetBlue Airways 311 on the same route79.1%
- Boston Logan International (BOS) delay statistics
- Chicago O'Hare International (ORD) 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.