Flight number record

B6 378

JetBlue Airways · San Francisco to Fort Lauderdale

Route: SFO → FLL
Departs: 23:59
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 378, check with JetBlue Airways.

B6 378 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 363 flights, with a median arrival 2 minutes early.

On time

75.7%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

8.6%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 2026. Beyond the headline rate, 8.6% 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 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 10:35 (49 flights) and 21:44 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:5962 flights17.1%
Departs 10:3549 flights13.5%
Departs 21:4440 flights11.0%

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 23:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and B6 378 runs 5 points better at 75.7%. 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 378 next to SFO to FLL

Every carrier on SFO to FLL combined arrived on time 81.2% of the time across 1,270 flights, so B6 378 is 6 points behind it. JetBlue flew 777 flights on the same city pair under all its flight numbers, including this one, and those ran 78.2% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 3 points.

B6 378 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 378thin sample	363	75.7%	68 min	0.00%	B+
All JetBlue Airways on SFO–FLL	777	78.2%	71 min	0.39%	B+
All carriers on SFO–FLL	1,270	81.2%	64 min	0.39%	B+
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	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 Jan–Mar 2026 at 66.7%, a swing of 15 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 202592 flights75.8%
Oct–Dec 202590 flights78.9%
Jan–Mar 202690 flights66.7%
Apr–Jun 202691 flights81.3%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, B6 378 ranged from 71.2% on Sunday to 78.8% on Saturday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why B6 378 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 5,961 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.

Late-arriving aircraft
45%
Carrier
38%
National Airspace System
17%

45% 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 5,961 reported delay minutes here, that single category outweighs weather by 45 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 5,961 delay minutes reported on B6 378.

Cancellations are rare at 0.00%, below the national 1.81% 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

8.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

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: 6 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.

Where to go next

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.

Key figures