Flight number record
B6 423
JetBlue Airways · New York to Los Angeles
- Route
- JFK → LAX
- Departs
- 13:00
- Flights
- 341
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 341 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so B6 423 runs 8 points behind the country as a whole. Across a thousand flights that is about 77 extra late arrivals.
Key figures
On time
69.6%
Arrivals under 15 minutes late, of 332 completed flights
Avg delay
105 min
Across delayed arrivals only, not all flights
Cancelled
2.64%
National rate is 1.89%
1 hour+ late
16.6%
National rate is 8.3%
These figures cover 341 flights between September 2025 and August 2026. Beyond the headline rate, 16.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 423 flies
B6 423 flies JFK to LAX without a single fixed slot. Its most common scheduled departure was 13:00, used on 72 of 341 flights, with 19:29 (35 flights) next.
- Departs 13:0072 flights21.1%
- Departs 19:2935 flights10.3%
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 13:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and B6 423 runs 9 points worse at 69.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
B6 423 next to JFK to LAX
Every carrier on JFK to LAX combined arrived on time 75.4% of the time across 10,285 flights, so B6 423 is 6 points behind it. JetBlue flew 3,480 flights on the same city pair under all its flight numbers, including this one, and those ran 72.5% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 423thin sample | 341 | 69.6% | 105 min | 2.64% | C |
| All JetBlue Airways on JFK–LAX | 3,480 | 72.5% | 73 min | 3.19% | C− |
| All carriers on JFK–LAX | 10,285 | 75.4% | 78 min | 2.78% | B |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | 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 100.0% on time and its weakest Oct–Dec 2025 at 60.0%, a swing of 40 points on roughly 68 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 202530 flights100.0%
- Oct–Dec 202591 flights60.0%
- Jan–Mar 202676 flights69.3%
- Apr–Jun 202683 flights74.4%
- Jul–Sep 202661 flights61.8%
Scale runs 50% to 100%.
By weekday, B6 423 did best on Wednesday at 85.4% on time and worst on Sunday at 54.3%. Each day rests on about 49 flights, so a gap of 31 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 423 runs when it is late
B6 423 often beats the schedule: 120 of 332 completed flights, 36%, arrived 15 minutes or more early. When B6 423 is late it tends to be very late: 55 of its 101 late arrivals were an hour or more behind, and 27 were two hours or more.
- 15+ min early120 flights36.1%
- Within 15 min111 flights33.4%
- 15–29 min late29 flights8.7%
- 30–59 min late17 flights5.1%
- 1–2 hours late28 flights8.4%
- 2+ hours late27 flights8.1%
Scale runs 0% to 100%.
Share of 332 completed flights by arrival against schedule.
12 of 94 late departures made up the time and arrived on time, 13% of them. In the other direction, 19 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 423
The latest arrival of the period was on 8 August 2026, 10 hours 52 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across August, January, July and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 August 2026 | 10 hours 52 minutes | Carrier |
| 18 January 2026 | 10 hours 30 minutes | Carrier |
| 21 July 2026 | 9 hours 38 minutes | Extreme weather |
| 10 July 2026 | 7 hours 42 minutes | Late-arriving aircraft |
| 20 May 2026 | 5 hours 30 minutes | Extreme weather |
Delay causes
Why B6 423 runs late
Late-arriving aircraft accounts for 43% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 33%Carrier
- 14%National Airspace System
- 10%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 11,000 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 10,573 delay minutes reported on B6 423.
Cancellations run at 2.64%, against 1.89% nationally. That is about one flight in 40 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
16.6% 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 2,475 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 341 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. 341 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, the cancellation rate is the figure to plan around on B6 423: 2.64% of its 341 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JFK to LAX, every carrier and departure
- LAX to JFK, the return direction
- Delta Air Lines 738 on the same route72.7%
- American Airlines 171 on the same route88.1%
- Delta Air Lines 773 on the same route78.6%
- American Airlines 117 on the same route69.1%
- American Airlines 255 on the same route78.3%
- American Airlines 341 on the same route76.4%
- John F. Kennedy International (JFK) 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.