Flight number record

B6 993

JetBlue Airways · Boston to Denver

Route: BOS → DEN
Departs: 19:31
Flights: 276
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 993, check with JetBlue Airways.

B6 993 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 276 flights, with a median arrival 6 minutes late.

The national on-time rate over the same period is 77.6%, so B6 993 runs 18 points behind the country as a whole. Across a thousand flights that is about 183 extra late arrivals.

On time

59.3%

Arrivals under 15 minutes late, of 270 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

1.45%

National rate is 1.81%

1 hour+ late

17.8%

National rate is 8.1%

These figures cover 276 flights between July 2025 and June 2026. Beyond the headline rate, 17.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When B6 993 flies

B6 993 flies BOS to DEN without a single fixed slot. Its most common scheduled departure was 19:31, used on 47 of 276 flights, with 18:59 (40 flights) and 18:45 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:3147 flights17.0%
Departs 18:5940 flights14.5%
Departs 18:4539 flights14.1%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 19:31 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and B6 993 runs 9 points worse at 59.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

B6 993 next to BOS to DEN

Every carrier on BOS to DEN combined arrived on time 76.5% of the time across 3,899 flights, so B6 993 is 17 points behind it. JetBlue flew 681 flights on the same city pair under all its flight numbers, including this one, and those ran 70.9% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 13 points.

B6 993 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 993thin sample	276	59.3%	67 min	1.45%	D
All JetBlue Airways on BOS–DEN	681	70.9%	60 min	1.76%	C
All carriers on BOS–DEN	3,899	76.5%	58 min	1.18%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	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 Jan–Mar 2026 at 47.1%, a swing of 29 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 202579 flights55.8%
Oct–Dec 202559 flights76.3%
Jan–Mar 202653 flights47.1%
Apr–Jun 202685 flights57.8%

Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, B6 993 did best on Saturday at 71.4% on time and worst on Sunday at 46.3%. Each day rests on about 39 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 993 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 7,369 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
49%
Carrier
28%
National Airspace System
21%
Extreme weather
2%

49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,369 reported delay minutes here, that single category outweighs weather by 28 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,369 delay minutes reported on B6 993.

Cancellations sit at 1.45% against a national 1.81%, which is ordinary. Diversions add another 0.72%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 17.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 17.8% 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures