Flight number record

B6 393

JetBlue Airways · Boston to Denver

Route: BOS → DEN
Departs: 10:00
Flights: 289
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 393, check with JetBlue Airways.

B6 393 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 289 flights, with a median arrival 10 minutes early.

On time

79.6%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

1.73%

National rate is 1.81%

1 hour+ late

7.4%

National rate is 8.1%

These figures cover 289 flights between July 2025 and June 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When B6 393 flies

B6 393 flies BOS to DEN without a single fixed slot. Its most common scheduled departure was 10:00, used on 64 of 289 flights, with 10:25 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:0064 flights22.1%
Departs 10:2532 flights11.1%

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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and B6 393 runs 5 points worse at 79.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

B6 393 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 393 is 3 points ahead of 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 beats by 7 points.

B6 393 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 393thin sample	289	79.6%	57 min	1.73%	B
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 393 quarter by quarter

B6 393 did not run the same all year. Its best quarter was Jul–Sep 2025 at 91.3% on time and its weakest Jan–Mar 2026 at 63.8%, a swing of 28 points on roughly 72 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 202592 flights91.3%
Oct–Dec 202581 flights78.8%
Jan–Mar 202684 flights63.8%
Apr–Jun 202632 flights87.5%

Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 393 ranged from 73.8% on Sunday to 83.7% on Tuesday. With about 41 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why B6 393 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 3,280 reported delay minutes.

National Airspace System
40%
Carrier
36%
Late-arriving aircraft
21%
Extreme weather
3%

40% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,314 minutes out of 3,280, against a national NAS share of 21%. The split is drawn from 3,280 delay minutes reported on B6 393.

Cancellations sit at 1.73% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

7.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

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 289 flights under B6 393 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. 289 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 393

For a booking, read B6 393 as 79.6% on time with 1.73% cancelled over 289 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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