Flight number record
B6 1274
JetBlue Airways · Charleston to New York
- Route
- CHS → JFK
- Departs
- 18:59
- Flights
- 261
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1274, check with JetBlue Airways.
B6 1274 draws a D−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 261 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.6%, so B6 1274 runs 14 points behind the country as a whole. Across a thousand flights that is about 138 extra late arrivals.
Key figures
On time
63.8%
Arrivals under 15 minutes late, of 246 completed flights
Avg delay
100 min
Across delayed arrivals only, not all flights
Cancelled
5.75%
National rate is 1.81%
1 hour+ late
18.7%
National rate is 8.1%
These figures cover 261 flights between July 2025 and June 2026. Beyond the headline rate, 18.7% 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 1274 flies
B6 1274 flies CHS to JFK without a single fixed slot. Its most common scheduled departure was 18:59, used on 57 of 261 flights, with 19:00 (27 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:5957 flights21.8%
- Departs 19:0027 flights10.3%
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 1274 runs 4 points worse at 63.8%. 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 1274 next to CHS to JFK
Every carrier on CHS to JFK combined arrived on time 73.8% of the time across 785 flights, so B6 1274 is 10 points behind it. JetBlue flew 633 flights on the same city pair under all its flight numbers, including this one, and those ran 72.8% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 1274thin sample | 261 | 63.8% | 100 min | 5.75% | D− |
| All JetBlue Airways on CHS–JFK | 633 | 72.8% | 85 min | 4.11% | C− |
| All carriers on CHS–JFK | 785 | 73.8% | 83 min | 5.10% | C− |
| JetBlue Airways, whole network | 234,468 | 72.7% | 76 min | 2.56% | C |
Across the year
B6 1274 quarter by quarter
B6 1274 did not run the same all year. Its best quarter was Apr–Jun 2026 at 72.2% on time and its weakest Jul–Sep 2025 at 54.7%, a swing of 18 points on roughly 87 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 202572 flights54.7%
- Oct–Dec 202586 flights66.3%
- Jan–Mar 202622 flights—
- Apr–Jun 202681 flights72.2%
Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, B6 1274 did best on Monday at 71.8% on time and worst on Sunday at 56.8%. Each day rests on about 37 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why B6 1274 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 50% of the 8,902 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.
- 50%Late-arriving aircraft
- 30%National Airspace System
- 19%Carrier
- 1%Extreme weather
50% 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 8,902 reported delay minutes here, that single category outweighs weather by 50 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 8,902 delay minutes reported on B6 1274.
Cancellations run at 5.75%, against 1.81% nationally. That is roughly one flight in fifteen 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 18.7% 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.
The 636 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 261 flights under B6 1274 in the data flew CHS to JFK. 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. 261 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 1274
For a booking, the cancellation rate is the figure to plan around on B6 1274: 5.75% of its 261 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
- CHS to JFK, every carrier and departure
- JFK to CHS, the return direction
- JetBlue Airways 2474 on the same route78.3%
- John F. Kennedy International (JFK) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.