Flight number record

B6 187

JetBlue Airways · Boston to Los Angeles

Route: BOS → LAX
Departs: 18:59
Flights: 272
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 187, check with JetBlue Airways.

B6 187 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 272 flights, with a median arrival 4 minutes late.

The national on-time rate over the same period is 77.6%, so B6 187 runs 14 points behind the country as a whole. Across a thousand flights that is about 143 extra late arrivals.

On time

63.3%

Arrivals under 15 minutes late, of 267 completed flights

Avg delay

84 min

Across delayed arrivals only, not all flights

Cancelled

1.47%

National rate is 1.81%

1 hour+ late

18.0%

National rate is 8.1%

These figures cover 272 flights between July 2025 and June 2026. Beyond the headline rate, 18.0% 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 187 flies

B6 187 flies BOS to LAX without a single fixed slot. Its most common scheduled departure was 18:59, used on 51 of 272 flights, with 20:20 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:5951 flights18.8%
Departs 20:2031 flights11.4%

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 18:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and B6 187 runs 5 points worse at 63.3%. 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 187 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 187 is 12 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 9 points.

B6 187 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 187thin sample	272	63.3%	84 min	1.47%	D
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 187 quarter by quarter

B6 187 did not run the same all year. Its best quarter was Jul–Sep 2025 at 70.7% on time and its weakest Oct–Dec 2025 at 54.4%, a swing of 16 points on roughly 91 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 flights70.7%
Oct–Dec 202590 flights54.4%
Jan–Mar 202690 flights64.7%

Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, B6 187 did best on Wednesday at 73.7% on time and worst on Sunday at 52.8%. Each day rests on about 39 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 187 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 8,226 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
52%
Carrier
23%
National Airspace System
22%
Extreme weather
3%

52% 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 8,226 reported delay minutes here, that single category outweighs weather by 17 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 8,226 delay minutes reported on B6 187.

Cancellations sit at 1.47% against a national 1.81%, which is ordinary. Diversions add another 0.37%.

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. 18.0% 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 272 flights under B6 187 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. 272 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 187

For a booking, B6 187 is a flight to put a long connection behind. 18.0% 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.

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