Flight number record
B6 387
JetBlue Airways · Boston to Los Angeles
- Route
- BOS → LAX
- Departs
- 20:25
- Flights
- 312
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 387, check with JetBlue Airways.
B6 387 draws a D. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 312 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so B6 387 runs 13 points behind the country as a whole. Across a thousand flights that is about 128 extra late arrivals.
Key figures
On time
64.5%
Arrivals under 15 minutes late, of 307 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
1.60%
National rate is 1.89%
1 hour+ late
13.0%
National rate is 8.3%
These figures cover 312 flights between September 2025 and August 2026. Beyond the headline rate, 13.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 387 flies
B6 387 flies BOS to LAX without a single fixed slot. Its most common scheduled departure was 20:25, used on 53 of 312 flights, with 14:45 (46 flights) and 09:15 (41 flights) next.
- Departs 20:2553 flights17.0%
- Departs 14:4546 flights14.7%
- Departs 09:1541 flights13.1%
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 20:25 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and B6 387 runs 6 points worse at 64.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
B6 387 next to BOS to LAX
Every carrier on BOS to LAX combined arrived on time 73.7% of the time across 4,794 flights, so B6 387 is 9 points behind it. JetBlue flew 1,642 flights on the same city pair under all its flight numbers, including this one, and those ran 72.2% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 387thin sample | 312 | 64.5% | 76 min | 1.60% | D |
| All JetBlue Airways on BOS–LAX | 1,642 | 72.2% | 73 min | 2.01% | C |
| All carriers on BOS–LAX | 4,794 | 73.7% | 79 min | 1.81% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | 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 Jul–Sep 2026 at 41.7%, a swing of 34 points on roughly 78 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 202525 flights—
- Oct–Dec 202582 flights75.6%
- Jan–Mar 202678 flights72.0%
- Apr–Jun 202665 flights60.0%
- Jul–Sep 202662 flights41.7%
Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, B6 387 did best on Tuesday at 74.5% on time and worst on Friday at 51.0%. Each day rests on about 45 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 387 runs when it is late
The 109 late arrivals split 37 under half an hour, 32 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early71 flights23.1%
- Within 15 min127 flights41.4%
- 15–29 min late37 flights12.1%
- 30–59 min late32 flights10.4%
- 1–2 hours late21 flights6.8%
- 2+ hours late19 flights6.2%
Scale runs 0% to 100%.
Share of 307 completed flights by arrival against schedule.
10 of 79 late departures made up the time and arrived on time, 13% of them. In the other direction, 40 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAX.
The worst days
Worst days for B6 387
The latest arrival of the period was on 2 August 2026, 15 hours 3 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 August 2026 | 15 hours 3 minutes | Extreme weather |
| 16 February 2026 | 7 hours 40 minutes | Late-arriving aircraft |
| 7 June 2026 | 4 hours 39 minutes | Late-arriving aircraft |
| 6 August 2026 | 4 hours 1 minute | Carrier |
| 23 October 2025 | 3 hours 50 minutes | Late-arriving aircraft |
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 8,229 reported delay minutes.
- 40%Late-arriving aircraft
- 31%National Airspace System
- 22%Carrier
- 8%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,229 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 8,229 delay minutes reported on B6 387.
Cancellations sit at 1.60% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
13.0% 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 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 312 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. 312 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, B6 387 is a flight to put a long connection behind. 13.0% 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 LAX, every carrier and departure
- LAX to BOS, the return direction
- Delta Air Lines 479 on the same route78.4%
- Delta Air Lines 318 on the same route70.8%
- JetBlue Airways 287 on the same route85.1%
- JetBlue Airways 487 on the same route72.3%
- Delta Air Lines 321 on the same route65.8%
- Boston Logan International (BOS) delay statistics
- Los Angeles International (LAX) 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.