Flight number record

B6 579

JetBlue Airways · Washington to Fort Lauderdale

Route: DCA → FLL
Departs: 11:00
Flights: 358
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 579, check with JetBlue Airways.

B6 579 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 358 flights, with a median arrival 6 minutes early.

On time

78.4%

Arrivals under 15 minutes late, of 347 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

2.51%

National rate is 1.81%

1 hour+ late

5.5%

National rate is 8.1%

These figures cover 358 flights between July 2025 and June 2026. The median arrival is 6 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.

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 93 of 358 flights, with 10:10 (61 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:0093 flights26.0%
Departs 10:1061 flights17.0%

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 11:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 579 runs level with that at 78.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 579 next to DCA to FLL

Every carrier on DCA to FLL combined arrived on time 68.3% of the time across 2,302 flights, so B6 579 is 10 points ahead of it. JetBlue flew 1,361 flights on the same city pair under all its flight numbers, including this one, and those ran 68.7% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 6 points.

B6 579 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 579thin sample	358	78.4%	59 min	2.51%	B
All JetBlue Airways on DCA–FLL	1,361	68.7%	78 min	2.42%	C
All carriers on DCA–FLL	2,302	68.3%	71 min	2.00%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	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 68.5%, a swing of 22 points on roughly 90 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 flights68.5%
Oct–Dec 202592 flights70.8%
Jan–Mar 202688 flights84.3%
Apr–Jun 202686 flights90.7%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 579 did best on Wednesday at 88.0% on time and worst on Tuesday at 72.3%. Each day rests on about 51 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 579 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 4,435 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
47%
Carrier
30%
National Airspace System
23%
Extreme weather
0%

47% 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 4,435 reported delay minutes here, that single category outweighs weather by 47 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 4,435 delay minutes reported on B6 579.

Cancellations run at 2.51%, against 1.81% nationally. That is about one flight in 40 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

5.5% 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.

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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 358 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. 358 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: 2.51% of its 358 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.

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