Flight number record
B6 378
JetBlue Airways · San Francisco to Fort Lauderdale
- Route
- SFO → FLL
- Departs
- 23:59
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 378, check with JetBlue Airways.
B6 378 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 363 flights, with a median arrival 1 minute early.
Key figures
On time
74.0%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
9.9%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 9.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When B6 378 flies
B6 378 flies SFO to FLL without a single fixed slot. Its most common scheduled departure was 23:59, used on 62 of 363 flights, with 11:00 (55 flights) and 10:35 (49 flights) next.
- Departs 23:5962 flights17.1%
- Departs 11:0055 flights15.2%
- Departs 10:3549 flights13.5%
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 23:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and B6 378 runs 4 points better at 74.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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 378 next to SFO to FLL
Every carrier on SFO to FLL combined arrived on time 79.3% of the time across 1,242 flights, so B6 378 is 5 points behind it. JetBlue flew 757 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 378thin sample | 363 | 74.0% | 70 min | 0.00% | C+ |
| All JetBlue Airways on SFO–FLL | 757 | 76.5% | 69 min | 0.13% | B+ |
| All carriers on SFO–FLL | 1,242 | 79.3% | 61 min | 0.08% | B+ |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 378 quarter by quarter
B6 378 did not run the same all year. Its best quarter was Apr–Jun 2026 at 81.3% on time and its weakest Jul–Sep 2026 at 62.9%, a swing of 18 points on roughly 91 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 flights—
- Oct–Dec 202590 flights78.9%
- Jan–Mar 202690 flights66.7%
- Apr–Jun 202691 flights81.3%
- Jul–Sep 202662 flights62.9%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, B6 378 ranged from 69.2% on Friday to 76.5% on Thursday. With about 52 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late B6 378 runs when it is late
The 94 late arrivals split 34 under half an hour, 24 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early70 flights19.3%
- Within 15 min198 flights54.7%
- 15–29 min late34 flights9.4%
- 30–59 min late24 flights6.6%
- 1–2 hours late20 flights5.5%
- 2+ hours late16 flights4.4%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 72 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 30 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 FLL.
The worst days
Worst days for B6 378
The latest arrival of the period was on 10 November 2025, 12 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 November 2025 | 12 hours 13 minutes | Carrier |
| 21 December 2025 | 6 hours 8 minutes | Carrier |
| 22 December 2025 | 3 hours 6 minutes | Late-arriving aircraft |
| 12 April 2026 | 3 hours 1 minute | Late-arriving aircraft |
| 6 March 2026 | 2 hours 56 minutes | Late-arriving aircraft |
Delay causes
Why B6 378 runs late
Late-arriving aircraft accounts for 46% of the 6,579 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 37%Carrier
- 17%National Airspace System
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,579 reported delay minutes here, that single category outweighs weather by 46 to one. The split is drawn from 6,579 delay minutes reported on B6 378.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
9.9% 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 2,584 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 363 flights under B6 378 in the data flew SFO to FLL. 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. 363 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 378
For a booking, B6 378 is one of the weaker ways to fly SFO to FLL: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- SFO to FLL, every carrier and departure
- FLL to SFO, the return direction
- San Francisco International (SFO) delay statistics
- Fort Lauderdale-Hollywood International (FLL) 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.