Flight number record
B6 70
JetBlue Airways · Fort Lauderdale to Boston
- Route
- FLL → BOS
- Departs
- 12:45
- Flights
- 277
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s B6 70, check with JetBlue Airways.
B6 70 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 277 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.6%, so B6 70 runs 20 points behind the country as a whole. Across a thousand flights that is about 196 extra late arrivals.
Key figures
On time
58.0%
Arrivals under 15 minutes late, of 269 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
2.53%
National rate is 1.81%
1 hour+ late
19.0%
National rate is 8.1%
These figures cover 277 flights between July 2025 and June 2026. Beyond the headline rate, 19.0% 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 70 flies
B6 70 flies FLL to BOS without a single fixed slot. Its most common scheduled departure was 12:45, used on 60 of 277 flights, with 13:25 (43 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:4560 flights21.7%
- Departs 13:2543 flights15.5%
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 12:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 70 runs 21 points worse at 58.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
B6 70 next to FLL to BOS
Every carrier on FLL to BOS combined arrived on time 66.5% of the time across 3,406 flights, so B6 70 is 9 points behind it. JetBlue flew 1,952 flights on the same city pair under all its flight numbers, including this one, and those ran 65.6% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight trails by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 70thin sample | 277 | 58.0% | 67 min | 2.53% | D |
| All JetBlue Airways on FLL–BOS | 1,952 | 65.6% | 78 min | 2.92% | C |
| All carriers on FLL–BOS | 3,406 | 66.5% | 78 min | 3.26% | C− |
| JetBlue Airways, whole network | 234,468 | 72.7% | 76 min | 2.56% | C |
Across the year
B6 70 quarter by quarter
Quarter by quarter B6 70 held fairly steady: 55.1% in Jul–Sep 2025, 64.2% in Oct–Dec 2025 and 57.1% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202591 flights55.1%
- Oct–Dec 202572 flights64.2%
- Jan–Mar 202623 flights—
- Apr–Jun 202691 flights57.1%
Scale runs 45% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, B6 70 did best on Saturday at 74.4% on time and worst on Friday at 51.3%. Each day rests on about 40 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Delay causes
Why B6 70 runs late
One category carries most of the weight here. National Airspace System accounts for 53% of the 7,546 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.
- 53%National Airspace System
- 30%Late-arriving aircraft
- 12%Carrier
- 5%Extreme weather
- 0%Security
53% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,988 minutes out of 7,546, against a national NAS share of 21%. The split is drawn from 7,546 delay minutes reported on B6 70.
Cancellations run at 2.53%, against 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 19.0% 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.
The 1,237 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 277 flights under B6 70 in the data flew FLL to BOS. 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. 277 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 70
For a booking, the cancellation rate is the figure to plan around on B6 70: 2.53% of its 277 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- FLL to BOS, every carrier and departure
- BOS to FLL, the return direction
- JetBlue Airways 470 on the same route60.3%
- Delta Air Lines 1401 on the same route68.1%
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- Boston Logan International (BOS) 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
- How often a connection fails at the major US hubs
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.