Flight number record
B6 394
JetBlue Airways · Denver to Boston
- Route
- DEN → BOS
- Departs
- 14:45
- Flights
- 309
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 394, check with JetBlue Airways.
B6 394 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 309 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.3%, so B6 394 runs 16 points behind the country as a whole. Across a thousand flights that is about 155 extra late arrivals.
Key figures
On time
61.8%
Arrivals under 15 minutes late, of 293 completed flights
Avg delay
93 min
Across delayed arrivals only, not all flights
Cancelled
3.88%
National rate is 1.89%
1 hour+ late
18.8%
National rate is 8.3%
These figures cover 309 flights between September 2025 and August 2026. Beyond the headline rate, 18.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 394 flies
B6 394 flies DEN to BOS without a single fixed slot. Its most common scheduled departure was 14:45, used on 44 of 309 flights, with 14:10 (31 flights) next.
- Departs 14:4544 flights14.2%
- Departs 14:1031 flights10.0%
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 14:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 394 runs 10 points worse at 61.8%. 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 394 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 394 is 8 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 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 394thin sample | 309 | 61.8% | 93 min | 3.88% | D− |
| 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 394 quarter by quarter
B6 394 did not run the same all year. Its best quarter was Oct–Dec 2025 at 67.5% on time and its weakest Jul–Sep 2026 at 42.3%, a swing of 25 points on roughly 62 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 flights63.3%
- Oct–Dec 202581 flights67.5%
- Jan–Mar 202684 flights67.1%
- Apr–Jun 202652 flights63.5%
- Jul–Sep 202662 flights42.3%
Scale runs 35% to 75%.
By weekday, B6 394 did best on Wednesday at 67.4% on time and worst on Friday at 53.3%. Each day rests on about 44 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 394 runs when it is late
The 112 late arrivals split 31 under half an hour, 26 between 30 and 60 minutes, and 55 an hour or more.
- 15+ min early69 flights23.5%
- Within 15 min112 flights38.2%
- 15–29 min late31 flights10.6%
- 30–59 min late26 flights8.9%
- 1–2 hours late35 flights11.9%
- 2+ hours late20 flights6.8%
Scale runs 0% to 100%.
Share of 293 completed flights by arrival against schedule.
22 of 124 late departures made up the time and arrived on time, 18% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for B6 394
The latest arrival of the period was on 23 September 2025, 20 hours behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across September, July, November, August and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 September 2025 | 20 hours | Carrier |
| 1 July 2026 | 18 hours 19 minutes | Carrier |
| 14 November 2025 | 5 hours 58 minutes | National Airspace System |
| 8 August 2026 | 4 hours 36 minutes | Late-arriving aircraft |
| 13 October 2025 | 4 hours 32 minutes | National Airspace System |
Delay causes
Why B6 394 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 10,000 reported delay minutes.
- 37%Carrier
- 35%National Airspace System
- 28%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,821 of the 10,000 delay minutes reported here. The split is drawn from 10,446 delay minutes reported on B6 394.
Cancellations run at 3.88%, against 1.89% nationally. That is about one flight in 25 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
18.8% 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 309 flights under B6 394 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. 309 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 394
For a booking, the cancellation rate is the figure to plan around on B6 394: 3.88% of its 309 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
- 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 994 on the same route67.2%
- 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
- What a cancellation rate actually tells you (and what it hides)
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.