Flight number record
B6 579
JetBlue Airways · Washington to Fort Lauderdale
- Route
- DCA → FLL
- Departs
- 11:00
- Flights
- 357
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 579, check with JetBlue Airways.
B6 579 lands a B−, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 357 flights, with a median arrival 8 minutes early.
Set against the rest of the country, B6 579's record is 4 points better than the US average of 77.3%. That gap is worth roughly 42 fewer late arrivals for every thousand flights.
Key figures
On time
81.5%
Arrivals under 15 minutes late, of 340 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
4.48%
National rate is 1.89%
1 hour+ late
6.2%
National rate is 8.3%
These figures cover 357 flights between September 2025 and August 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When B6 579 flies
B6 579 flies DCA to FLL without a single fixed slot. Its most common scheduled departure was 11:00, used on 100 of 357 flights.
- Departs 11:00100 flights28.0%
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 11:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and B6 579 runs 3 points better at 81.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
B6 579 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 579 is 14 points ahead of 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 beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 579thin sample | 357 | 81.5% | 68 min | 4.48% | B− |
| 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 579 quarter by quarter
B6 579 did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.7% on time and its weakest Jul–Sep 2025 at 70.0%, a swing of 21 points on roughly 71 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 flights70.0%
- Oct–Dec 202592 flights70.8%
- Jan–Mar 202688 flights84.3%
- Apr–Jun 202686 flights90.7%
- Jul–Sep 202661 flights86.5%
Scale runs 60% to 95%.
By weekday, B6 579 did best on Saturday at 88.0% on time and worst on Sunday at 71.4%. Each day rests on about 51 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late B6 579 runs when it is late
B6 579 often beats the schedule: 99 of 340 completed flights, 29%, arrived 15 minutes or more early. The 63 late arrivals split 18 under half an hour, 24 between 30 and 60 minutes, and 21 an hour or more.
- 15+ min early99 flights29.1%
- Within 15 min178 flights52.4%
- 15–29 min late18 flights5.3%
- 30–59 min late24 flights7.1%
- 1–2 hours late13 flights3.8%
- 2+ hours late8 flights2.4%
Scale runs 0% to 100%.
Share of 340 completed flights by arrival against schedule.
12 of 63 late departures made up the time and arrived on time, 19% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for B6 579
The latest arrival of the period was on 4 November 2025, 6 hours 38 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 November 2025 | 6 hours 38 minutes | Late-arriving aircraft |
| 16 August 2026 | 4 hours 49 minutes | Late-arriving aircraft |
| 8 December 2025 | 3 hours 34 minutes | Late-arriving aircraft |
| 28 February 2026 | 3 hours 23 minutes | Late-arriving aircraft |
| 9 November 2025 | 2 hours 20 minutes | Late-arriving aircraft |
Delay causes
Why B6 579 runs late
Late-arriving aircraft accounts for 48% of the 4,275 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Late-arriving aircraft
- 30%Carrier
- 21%National Airspace System
- 0%Extreme weather
48% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,275 reported delay minutes here, that single category outweighs weather by 48 to one. The split is drawn from 4,275 delay minutes reported on B6 579.
Cancellations run at 4.48%, against 1.89% nationally. That is roughly 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
6.2% of arrivals land an hour or more late, close to the national 8.3%, so 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.
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 357 flights under B6 579 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. 357 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 579
For a booking, the cancellation rate is the figure to plan around on B6 579: 4.48% of its 357 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
- DCA to FLL, every carrier and departure
- FLL to DCA, the return direction
- JetBlue Airways 379 on the same route77.1%
- JetBlue Airways 1579 on the same route57.2%
- 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.