Flight number record

B6 423

JetBlue Airways · New York to Los Angeles

Route: JFK → LAX
Departs: 12:10
Flights: 342
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 423, check with JetBlue Airways.

B6 423 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 342 flights, with a median arrival 8 minutes early.

On time

74.0%

Arrivals under 15 minutes late, of 339 completed flights

Avg delay

82 min

Across delayed arrivals only, not all flights

Cancelled

0.88%

National rate is 1.81%

1 hour+ late

12.4%

National rate is 8.1%

These figures cover 342 flights between July 2025 and June 2026. Beyond the headline rate, 12.4% 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 423 flies

B6 423 flies JFK to LAX without a single fixed slot. Its most common scheduled departure was 12:10, used on 66 of 342 flights, with 19:29 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:1066 flights19.3%
Departs 19:2935 flights10.2%

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 12:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 423 runs 5 points worse at 74.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 423 next to JFK to LAX

Every carrier on JFK to LAX combined arrived on time 77.6% of the time across 10,284 flights, so B6 423 is 4 points behind it. JetBlue flew 3,486 flights on the same city pair under all its flight numbers, including this one, and those ran 75.6% on time. Across its whole network JetBlue Airways managed 72.7%, close to this flight's figure.

B6 423 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 423thin sample	342	74.0%	82 min	0.88%	C+
All JetBlue Airways on JFK–LAX	3,486	75.6%	69 min	2.01%	B
All carriers on JFK–LAX	10,284	77.6%	77 min	1.94%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 423 quarter by quarter

B6 423 did not run the same all year. Its best quarter was Jul–Sep 2025 at 91.3% on time and its weakest Oct–Dec 2025 at 60.0%, a swing of 31 points on roughly 86 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 202591 flights60.0%
Jan–Mar 202676 flights69.3%
Apr–Jun 202683 flights74.4%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 423 did best on Wednesday at 89.8% on time and worst on Sunday at 63.8%. Each day rests on about 49 flights, so a gap of 26 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 423 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 7,245 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
24%
National Airspace System
18%
Extreme weather
6%

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 7,245 reported delay minutes here, that single category outweighs weather by 9 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 7,245 delay minutes reported on B6 423.

Cancellations are rare at 0.88%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

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. 12.4% 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 2,475 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 342 flights under B6 423 in the data flew JFK 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. 342 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 423

For a booking, B6 423 is a flight to put a long connection behind. 12.4% 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