Flight number record
B6 312
JetBlue Airways · Chicago to Boston
- Route
- ORD → BOS
- Departs
- 10:56
- Flights
- 335
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 312, check with JetBlue Airways.
B6 312 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 335 flights, with a median arrival 8 minutes early.
The national on-time rate over the same period is 77.3%, so B6 312 runs 8 points behind the country as a whole. Across a thousand flights that is about 78 extra late arrivals.
Key figures
On time
69.5%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
2.09%
National rate is 1.89%
1 hour+ late
11.9%
National rate is 8.3%
These figures cover 335 flights between September 2025 and August 2026. Beyond the headline rate, 11.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 312 flies
B6 312 flies ORD to BOS without a single fixed slot. Its most common scheduled departure was 10:56, used on 48 of 335 flights.
- Departs 10:5648 flights14.3%
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 10:56 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and B6 312 runs 14 points worse at 69.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
B6 312 next to ORD to BOS
Every carrier on ORD to BOS combined arrived on time 66.6% of the time across 7,864 flights, so B6 312 is 3 points ahead of it. JetBlue flew 553 flights on the same city pair under all its flight numbers, including this one, and those ran 68.1% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 312thin sample | 335 | 69.5% | 96 min | 2.09% | C |
| All JetBlue Airways on ORD–BOS | 553 | 68.1% | 98 min | 3.98% | C− |
| All carriers on ORD–BOS | 7,864 | 66.6% | 81 min | 2.99% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 312 quarter by quarter
B6 312 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.9% on time and its weakest Jul–Sep 2026 at 57.6%, a swing of 28 points on roughly 67 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 flights76.7%
- Oct–Dec 202573 flights63.0%
- Jan–Mar 202685 flights64.2%
- Apr–Jun 202685 flights85.9%
- Jul–Sep 202662 flights57.6%
Scale runs 50% to 90%.
By weekday, B6 312 did best on Wednesday at 79.6% on time and worst on Sunday at 60.9%. Each day rests on about 48 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 312 runs when it is late
B6 312 often beats the schedule: 108 of 328 completed flights, 33%, arrived 15 minutes or more early. The 100 late arrivals split 28 under half an hour, 33 between 30 and 60 minutes, and 39 an hour or more.
- 15+ min early108 flights32.9%
- Within 15 min120 flights36.6%
- 15–29 min late28 flights8.5%
- 30–59 min late33 flights10.1%
- 1–2 hours late18 flights5.5%
- 2+ hours late21 flights6.4%
Scale runs 0% to 100%.
Share of 328 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 84 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 24 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 BOS.
The worst days
Worst days for B6 312
The latest arrival of the period was on 27 July 2026, 26 hours 34 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 July 2026 | 26 hours 34 minutes | Carrier |
| 6 March 2026 | 9 hours 24 minutes | Late-arriving aircraft |
| 21 July 2026 | 6 hours 5 minutes | Late-arriving aircraft |
| 14 December 2025 | 5 hours 35 minutes | Late-arriving aircraft |
| 3 August 2026 | 5 hours 13 minutes | Late-arriving aircraft |
Delay causes
Why B6 312 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 9,556 reported delay minutes.
- 39%Late-arriving aircraft
- 35%Carrier
- 25%National Airspace System
- 0%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,556 reported delay minutes here, that single category outweighs weather by 39 to one. The split is drawn from 9,556 delay minutes reported on B6 312.
Cancellations sit at 2.09% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
11.9% 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 335 flights under B6 312 in the data flew ORD to BOS. 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. 335 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 312
For a booking, read B6 312 as 69.5% on time with 2.09% cancelled over 335 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to BOS, every carrier and departure
- BOS to ORD, the return direction
- United Airlines 1693 on the same route62.3%
- Chicago O'Hare International (ORD) delay statistics
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.