Flight number record
B6 993
JetBlue Airways · Boston to Denver
- Route
- BOS → DEN
- Departs
- 19:59
- Flights
- 276
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 993, check with JetBlue Airways.
B6 993 earns a D, which is as low as this site's scale goes for a reason. Only 57.2% of flights arrive inside the 15-minute window, 20 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 276 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so B6 993 runs 20 points behind the country as a whole. Across a thousand flights that is about 201 extra late arrivals.
Key figures
On time
57.2%
Arrivals under 15 minutes late, of 269 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.81%
National rate is 1.89%
1 hour+ late
18.2%
National rate is 8.3%
These figures cover 276 flights between September 2025 and August 2026. Beyond the headline rate, 18.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 993 flies
B6 993 flies BOS to DEN without a single fixed slot. Its most common scheduled departure was 19:59, used on 51 of 276 flights, with 19:31 (47 flights) and 18:45 (39 flights) next.
- Departs 19:5951 flights18.5%
- Departs 19:3147 flights17.0%
- Departs 18:4539 flights14.1%
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 19:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and B6 993 runs 11 points worse at 57.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
B6 993 next to BOS to DEN
Every carrier on BOS to DEN combined arrived on time 75.7% of the time across 3,847 flights, so B6 993 is 19 points behind it. JetBlue flew 690 flights on the same city pair under all its flight numbers, including this one, and those ran 68.4% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 993thin sample | 276 | 57.2% | 69 min | 1.81% | D |
| All JetBlue Airways on BOS–DEN | 690 | 68.4% | 63 min | 2.61% | C |
| All carriers on BOS–DEN | 3,847 | 75.7% | 62 min | 1.38% | B |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 993 quarter by quarter
B6 993 did not run the same all year. Its best quarter was Oct–Dec 2025 at 76.3% on time and its weakest Jul–Sep 2026 at 41.4%, a swing of 35 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 flights76.3%
- Jan–Mar 202653 flights47.1%
- Apr–Jun 202685 flights57.8%
- Jul–Sep 202661 flights41.4%
Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, B6 993 did best on Saturday at 66.7% on time and worst on Sunday at 43.9%. Each day rests on about 39 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 993 runs when it is late
The 115 late arrivals split 31 under half an hour, 35 between 30 and 60 minutes, and 49 an hour or more.
- 15+ min early66 flights24.5%
- Within 15 min88 flights32.7%
- 15–29 min late31 flights11.5%
- 30–59 min late35 flights13.0%
- 1–2 hours late31 flights11.5%
- 2+ hours late18 flights6.7%
Scale runs 0% to 100%.
Share of 269 completed flights by arrival against schedule.
19 of 123 late departures made up the time and arrived on time, 15% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for B6 993
The latest arrival of the period was on 21 July 2026, 5 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 July 2026 | 5 hours 32 minutes | Carrier |
| 4 January 2026 | 5 hours 16 minutes | Late-arriving aircraft |
| 19 July 2026 | 4 hours 23 minutes | Carrier |
| 16 August 2026 | 3 hours 51 minutes | Late-arriving aircraft |
| 23 August 2026 | 3 hours 50 minutes | Late-arriving aircraft |
Delay causes
Why B6 993 runs late
Late-arriving aircraft accounts for 50% of the 7,936 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Late-arriving aircraft
- 31%Carrier
- 17%National Airspace System
- 2%Extreme weather
50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,936 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 7,936 delay minutes reported on B6 993.
Cancellations sit at 1.81% against a national 1.89%, which is ordinary. Diversions add another 0.72%.
Connections and routes
What a delay on this flight costs
18.2% 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 993 in the data flew BOS to DEN. 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 993
For a booking, B6 993 is a flight to put a long connection behind. 18.2% 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 DEN, every carrier and departure
- DEN to BOS, the return direction
- Delta Air Lines 499 on the same route83.6%
- United Airlines 414 on the same route89.4%
- United Airlines 647 on the same route90.5%
- United Airlines 2297 on the same route85.1%
- United Airlines 800 on the same route72.9%
- United Airlines 662 on the same route89.3%
- Boston Logan International (BOS) delay statistics
- Denver International (DEN) 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.