Flight number record

B6 1336

JetBlue Airways · Detroit to Boston

Route: DTW → BOS
Departs: 11:57
Flights: 263
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1336, check with JetBlue Airways.

B6 1336 lands a B−, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 263 flights, with a median arrival 6 minutes early.

On time

76.3%

Arrivals under 15 minutes late, of 253 completed flights

Avg delay

88 min

Across delayed arrivals only, not all flights

Cancelled

3.80%

National rate is 1.81%

1 hour+ late

7.5%

National rate is 8.1%

These figures cover 263 flights between July 2025 and June 2026. The median arrival is 6 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 1336 flies

B6 1336 flies DTW to BOS without a single fixed slot. Its most common scheduled departure was 11:57, used on 28 of 263 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:5728 flights10.6%

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 11:57 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 1336 runs 3 points worse at 76.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 1336 next to DTW to BOS

Every carrier on DTW to BOS combined arrived on time 74.8% of the time across 2,588 flights, so B6 1336 is 2 points ahead of it. JetBlue flew 723 flights on the same city pair under all its flight numbers, including this one, and those ran 74.0% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 4 points.

B6 1336 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1336thin sample	263	76.3%	88 min	3.80%	B−
All JetBlue Airways on DTW–BOS	723	74.0%	87 min	3.18%	C−
All carriers on DTW–BOS	2,588	74.8%	72 min	2.09%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 1336 quarter by quarter

B6 1336 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.9% on time and its weakest Oct–Dec 2025 at 64.3%, a swing of 20 points on roughly 66 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 202564 flights83.9%
Oct–Dec 202571 flights64.3%
Jan–Mar 202649 flights79.1%
Apr–Jun 202679 flights79.5%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1336 did best on Wednesday at 90.9% on time and worst on Friday at 63.4%. Each day rests on about 38 flights, so a gap of 28 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1336 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 5,251 reported delay minutes.

Carrier
38%
Late-arriving aircraft
35%
National Airspace System
28%

35% 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 5,251 reported delay minutes here, that single category outweighs weather by 35 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 5,251 delay minutes reported on B6 1336.

Cancellations run at 3.80%, against 1.81% 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

7.5% 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 an hour and a half, which a normal layover absorbs.

The 632 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 263 flights under B6 1336 in the data flew DTW 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. 263 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 1336

For a booking, the cancellation rate is the figure to plan around on B6 1336: 3.80% of its 263 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.

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