Flight number record
B6 70
JetBlue Airways · Fort Lauderdale to Boston
- Route
- FLL → BOS
- Departs
- 13:25
- Flights
- 277
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 70, check with JetBlue Airways.
B6 70 earns a D−, which is as low as this site's scale goes for a reason. Only 57.4% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 277 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.3%, so B6 70 runs 20 points behind the country as a whole. Across a thousand flights that is about 199 extra late arrivals.
Key figures
On time
57.4%
Arrivals under 15 minutes late, of 263 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
4.69%
National rate is 1.89%
1 hour+ late
21.7%
National rate is 8.3%
These figures cover 277 flights between September 2025 and August 2026. Beyond the headline rate, 21.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 70 flies
B6 70 flies FLL to BOS without a single fixed slot. Its most common scheduled departure was 13:25, used on 43 of 277 flights.
- Departs 13:2543 flights15.5%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and B6 70 runs 21 points worse at 57.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
B6 70 next to FLL to BOS
Every carrier on FLL to BOS combined arrived on time 66.8% of the time across 3,293 flights, so B6 70 is 9 points behind it. JetBlue flew 1,960 flights on the same city pair under all its flight numbers, including this one, and those ran 65.9% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 70thin sample | 277 | 57.4% | 74 min | 4.69% | D− |
| All JetBlue Airways on FLL–BOS | 1,960 | 65.9% | 76 min | 3.37% | C− |
| All carriers on FLL–BOS | 3,293 | 66.8% | 77 min | 3.67% | C− |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 70 quarter by quarter
Quarter by quarter B6 70 held fairly steady: 64.2% in Oct–Dec 2025, 57.1% in Apr–Jun 2026 and 54.5% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202529 flights—
- Oct–Dec 202572 flights64.2%
- Jan–Mar 202623 flights—
- Apr–Jun 202691 flights57.1%
- Jul–Sep 202662 flights54.5%
Scale runs 45% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, B6 70 did best on Saturday at 71.1% on time and worst on Thursday at 51.4%. Each day rests on about 40 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 70 runs when it is late
When B6 70 is late it tends to be very late: 57 of its 112 late arrivals were an hour or more behind, and 18 were two hours or more.
- 15+ min early46 flights17.5%
- Within 15 min105 flights39.9%
- 15–29 min late30 flights11.4%
- 30–59 min late25 flights9.5%
- 1–2 hours late39 flights14.8%
- 2+ hours late18 flights6.8%
Scale runs 0% to 100%.
Share of 263 completed flights by arrival against schedule.
18 of 116 late departures made up the time and arrived on time, 16% of them. In the other direction, 14 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 BOS.
The worst days
Worst days for B6 70
The latest arrival of the period was on 18 July 2026, 8 hours 24 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 July 2026 | 8 hours 24 minutes | National Airspace System |
| 29 June 2026 | 4 hours 21 minutes | Late-arriving aircraft |
| 17 June 2026 | 4 hours 16 minutes | Late-arriving aircraft |
| 16 September 2025 | 3 hours 40 minutes | National Airspace System |
| 10 November 2025 | 3 hours | National Airspace System |
Delay causes
Why B6 70 runs late
National Airspace System accounts for 53% of the 8,330 delay minutes carriers reported here, and the remaining four split what is left.
- 53%National Airspace System
- 34%Late-arriving aircraft
- 9%Carrier
- 3%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 4,454 minutes out of 8,330, against a national NAS share of 21%. The split is drawn from 8,330 delay minutes reported on B6 70.
Cancellations run at 4.69%, against 1.89% nationally. That is about one flight in twenty 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
21.7% 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.
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.
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: 4.69% of its 277 scheduled flights did not operate. A late arrival costs a little over 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 route61.3%
- 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
- 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.