Flight number record
B6 994
JetBlue Airways · Denver to Boston
- Route
- DEN → BOS
- Departs
- 23:37
- Flights
- 276
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 994, check with JetBlue Airways.
B6 994 draws a C. About one flight in three 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 276 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so B6 994 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 268 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.90%
National rate is 1.89%
1 hour+ late
16.0%
National rate is 8.3%
These figures cover 276 flights between September 2025 and August 2026. Beyond the headline rate, 16.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 994 flies
B6 994 flies DEN to BOS without a single fixed slot. Its most common scheduled departure was 23:37, used on 77 of 276 flights, with 23:59 (59 flights) next.
- Departs 23:3777 flights27.9%
- Departs 23:5959 flights21.4%
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 23:37 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and B6 994 runs 3 points worse at 67.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
B6 994 next to DEN to BOS
Every carrier on DEN to BOS combined arrived on time 69.6% of the time across 3,851 flights, so B6 994 is 2 points behind it. JetBlue flew 691 flights on the same city pair under all its flight numbers, including this one, and those ran 64.6% 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 994thin sample | 276 | 67.2% | 80 min | 2.90% | C |
| All JetBlue Airways on DEN–BOS | 691 | 64.6% | 84 min | 3.47% | D− |
| All carriers on DEN–BOS | 3,851 | 69.6% | 73 min | 1.45% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 994 quarter by quarter
B6 994 did not run the same all year. Its best quarter was Oct–Dec 2025 at 81.4% on time and its weakest Jul–Sep 2026 at 45.5%, a swing of 36 points on roughly 69 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 202559 flights81.4%
- Jan–Mar 202653 flights62.7%
- Apr–Jun 202685 flights68.2%
- Jul–Sep 202661 flights45.5%
Scale runs 35% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, B6 994 did best on Saturday at 78.8% on time and worst on Sunday at 50.0%. Each day rests on about 39 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 994 runs when it is late
B6 994 often beats the schedule: 100 of 268 completed flights, 37%, arrived 15 minutes or more early. The 88 late arrivals split 20 under half an hour, 25 between 30 and 60 minutes, and 43 an hour or more.
- 15+ min early100 flights37.3%
- Within 15 min80 flights29.9%
- 15–29 min late20 flights7.5%
- 30–59 min late25 flights9.3%
- 1–2 hours late28 flights10.4%
- 2+ hours late15 flights5.6%
Scale runs 0% to 100%.
Share of 268 completed flights by arrival against schedule.
20 of 108 late departures made up the time and arrived on time, 19% of them. No flight that left on time arrived late.
The worst days
Worst days for B6 994
The latest arrival of the period was on 26 June 2026, 10 hours 32 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in June 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 June 2026 | 10 hours 32 minutes | Late-arriving aircraft |
| 4 January 2026 | 5 hours 1 minute | Late-arriving aircraft |
| 26 February 2026 | 3 hours 44 minutes | Carrier |
| 14 June 2026 | 3 hours 37 minutes | Late-arriving aircraft |
| 18 June 2026 | 3 hours 29 minutes | Late-arriving aircraft |
Delay causes
Why B6 994 runs late
Late-arriving aircraft accounts for 77% of the 7,050 delay minutes carriers reported here, and the remaining four split what is left.
- 77%Late-arriving aircraft
- 21%Carrier
- 3%National Airspace System
77% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,050 reported delay minutes here, that single category outweighs weather by 77 to one. The split is drawn from 7,050 delay minutes reported on B6 994.
Cancellations run at 2.90%, against 1.89% nationally. That is roughly one flight in 30 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
16.0% 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.
At 1,754 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 276 flights under B6 994 in the data flew DEN 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. 276 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 994
For a booking, the cancellation rate is the figure to plan around on B6 994: 2.90% of its 276 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
- DEN to BOS, every carrier and departure
- BOS to DEN, the return direction
- Delta Air Lines 499 on the same route71.5%
- United Airlines 597 on the same route68.5%
- United Airlines 558 on the same route91.9%
- JetBlue Airways 394 on the same route61.8%
- Denver International (DEN) 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.