Flight number record

B6 387

JetBlue Airways · Boston to Los Angeles

Route: BOS → LAX
Departs: 14:45
Flights: 303
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 387, check with JetBlue Airways.

B6 387 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 303 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so B6 387 runs 7 points behind the country as a whole. Across a thousand flights that is about 69 extra late arrivals.

On time

70.7%

Arrivals under 15 minutes late, of 300 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

0.99%

National rate is 1.81%

1 hour+ late

10.3%

National rate is 8.1%

These figures cover 303 flights between July 2025 and June 2026. Beyond the headline rate, 10.3% 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 387 flies

B6 387 flies BOS to LAX without a single fixed slot. Its most common scheduled departure was 14:45, used on 99 of 303 flights, with 09:15 (41 flights) and 09:00 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:4599 flights32.7%
Departs 09:1541 flights13.5%
Departs 09:0041 flights13.5%

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 14:45 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and B6 387 runs level with that at 70.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 387 next to BOS to LAX

Every carrier on BOS to LAX combined arrived on time 74.9% of the time across 4,713 flights, so B6 387 is 4 points behind it. JetBlue flew 1,626 flights on the same city pair under all its flight numbers, including this one, and those ran 74.5% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 2 points.

B6 387 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 387thin sample	303	70.7%	65 min	0.99%	C+
All JetBlue Airways on BOS–LAX	1,626	74.5%	71 min	1.41%	C
All carriers on BOS–LAX	4,713	74.9%	76 min	1.42%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 387 quarter by quarter

B6 387 did not run the same all year. Its best quarter was Oct–Dec 2025 at 75.6% on time and its weakest Apr–Jun 2026 at 60.0%, a swing of 16 points on roughly 76 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 202578 flights73.1%
Oct–Dec 202582 flights75.6%
Jan–Mar 202678 flights72.0%
Apr–Jun 202665 flights60.0%

Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, B6 387 did best on Tuesday at 79.6% on time and worst on Friday at 55.1%. Each day rests on about 43 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 387 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 5,717 reported delay minutes.

Late-arriving aircraft
41%
National Airspace System
37%
Carrier
21%
Extreme weather
1%

41% 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 5,717 reported delay minutes here, that single category outweighs weather by 32 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 5,717 delay minutes reported on B6 387.

Cancellations sit at 0.99% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

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. 10.3% 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 2,611 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 303 flights under B6 387 in the data flew BOS to LAX. 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. 303 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 387

For a booking, read B6 387 as 70.7% on time with 0.99% cancelled over 303 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