Flight number record
B6 1579
JetBlue Airways · Washington to Fort Lauderdale
- Route
- DCA → FLL
- Departs
- 15:55
- Flights
- 329
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 1579, check with JetBlue Airways.
B6 1579 earns a D, which is as low as this site's scale goes for a reason. Only 57.2% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 329 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so B6 1579 runs 20 points behind the country as a whole. Across a thousand flights that is about 201 extra late arrivals.
Key figures
On time
57.2%
Arrivals under 15 minutes late, of 320 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
2.13%
National rate is 1.89%
1 hour+ late
24.1%
National rate is 8.3%
These figures cover 329 flights between September 2025 and August 2026. Beyond the headline rate, 24.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 1579 flies
B6 1579 flies DCA to FLL without a single fixed slot. Its most common scheduled departure was 15:55, used on 80 of 329 flights, with 15:59 (37 flights) and 14:45 (35 flights) next.
- Departs 15:5580 flights24.3%
- Departs 15:5937 flights11.2%
- Departs 14:4535 flights10.6%
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 15:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and B6 1579 runs 15 points worse at 57.2%. 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 1579 next to DCA to FLL
Every carrier on DCA to FLL combined arrived on time 67.7% of the time across 2,320 flights, so B6 1579 is 11 points behind it. JetBlue flew 1,380 flights on the same city pair under all its flight numbers, including this one, and those ran 68.1% 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 1579thin sample | 329 | 57.2% | 91 min | 2.13% | D |
| All JetBlue Airways on DCA–FLL | 1,380 | 68.1% | 80 min | 3.48% | C− |
| All carriers on DCA–FLL | 2,320 | 67.7% | 74 min | 2.80% | C |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | C− |
Across the year
B6 1579 quarter by quarter
B6 1579 did not run the same all year. Its best quarter was Jan–Mar 2026 at 64.3% on time and its weakest Jul–Sep 2026 at 32.2%, a swing of 32 points on roughly 82 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 20252 flights—
- Oct–Dec 202592 flights63.7%
- Jan–Mar 202688 flights64.3%
- Apr–Jun 202686 flights61.9%
- Jul–Sep 202661 flights32.2%
Scale runs 25% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, B6 1579 did best on Wednesday at 74.5% on time and worst on Friday at 37.5%. Each day rests on about 47 flights, so a gap of 37 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 1579 runs when it is late
When B6 1579 is late it tends to be very late: 77 of its 137 late arrivals were an hour or more behind, and 36 were two hours or more.
- 15+ min early64 flights20.0%
- Within 15 min119 flights37.2%
- 15–29 min late25 flights7.8%
- 30–59 min late35 flights10.9%
- 1–2 hours late41 flights12.8%
- 2+ hours late36 flights11.3%
Scale runs 0% to 100%.
Share of 320 completed flights by arrival against schedule.
22 of 144 late departures made up the time and arrived on time, 15% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for B6 1579
The latest arrival of the period was on 4 November 2025, 6 hours 18 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 November 2025 | 6 hours 18 minutes | Carrier |
| 16 March 2026 | 5 hours 38 minutes | Late-arriving aircraft |
| 16 November 2025 | 5 hours 21 minutes | Late-arriving aircraft |
| 14 July 2026 | 5 hours 12 minutes | Late-arriving aircraft |
| 4 January 2026 | 5 hours 11 minutes | Late-arriving aircraft |
Delay causes
Why B6 1579 runs late
Late-arriving aircraft accounts for 58% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Late-arriving aircraft
- 20%Carrier
- 19%National Airspace System
- 3%Extreme weather
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 17 to one. The split is drawn from 12,468 delay minutes reported on B6 1579.
Cancellations sit at 2.13% against a national 1.89%, which is ordinary. Diversions add another 0.61%.
Connections and routes
What a delay on this flight costs
24.1% 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 899 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 329 flights under B6 1579 in the data flew DCA 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. 329 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 1579
For a booking, B6 1579 is a flight to put a long connection behind. 24.1% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- DCA to FLL, every carrier and departure
- FLL to DCA, the return direction
- JetBlue Airways 579 on the same route81.5%
- JetBlue Airways 379 on the same route77.1%
- JetBlue Airways 1979 on the same route56.4%
- Ronald Reagan Washington National (DCA) 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.