Flight number record

B6 1579

JetBlue Airways · Washington to Fort Lauderdale

Route: DCA → FLL
Departs: 15:55
Flights: 330
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1579, check with JetBlue Airways.

B6 1579 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 330 flights, with a median arrival 3 minutes late.

The national on-time rate over the same period is 77.6%, so B6 1579 runs 18 points behind the country as a whole. Across a thousand flights that is about 176 extra late arrivals.

On time

60.0%

Arrivals under 15 minutes late, of 320 completed flights

Avg delay

98 min

Across delayed arrivals only, not all flights

Cancelled

2.42%

National rate is 1.81%

1 hour+ late

21.9%

National rate is 8.1%

These figures cover 330 flights between July 2025 and June 2026. Beyond the headline rate, 21.9% 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 1579 flies

B6 1579 flies DCA to FLL without a single fixed slot. Its most common scheduled departure was 15:55, used on 73 of 330 flights, with 17:10 (64 flights) and 15:59 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:5573 flights22.1%
Departs 17:1064 flights19.4%
Departs 15:5937 flights11.2%

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 15:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and B6 1579 runs 12 points worse at 60.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 1579 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 1579 is 8 points behind 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 trails by 13 points.

B6 1579 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1579thin sample	330	60.0%	98 min	2.42%	D
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 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 2025 at 45.9%, a swing of 18 points on roughly 83 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 202564 flights45.9%
Oct–Dec 202592 flights63.7%
Jan–Mar 202688 flights64.3%
Apr–Jun 202686 flights61.9%

Scale runs 35% to 70%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1579 did best on Wednesday at 72.3% on time and worst on Friday at 45.8%. Each day rests on about 47 flights, so a gap of 27 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1579 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 59% of the 13,000 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
59%
Carrier
22%
National Airspace System
15%
Extreme weather
4%

59% 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 13,000 reported delay minutes here, that single category outweighs weather by 14 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 12,537 delay minutes reported on B6 1579.

Cancellations sit at 2.42% against a national 1.81%, which is ordinary. Diversions add another 0.61%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 21.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 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 330 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. 330 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. 21.9% 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.

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