Flight number record

B6 519

JetBlue Airways · New York to Atlanta

Route: JFK → ATL
Departs: 08:10
Flights: 300
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 519, check with JetBlue Airways.

B6 519 sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 300 flights, with a median arrival 5 minutes early.

On time

74.6%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

5.33%

National rate is 1.81%

1 hour+ late

7.0%

National rate is 8.1%

These figures cover 300 flights between July 2025 and June 2026. The median arrival is 5 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 519 flies

B6 519 flies JFK to ATL without a single fixed slot. Its most common scheduled departure was 08:10, used on 50 of 300 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:1050 flights16.7%

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 08:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and B6 519 runs 10 points worse at 74.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

B6 519 next to JFK to ATL

Every carrier on JFK to ATL combined arrived on time 76.7% of the time across 4,272 flights, so B6 519 is 2 points behind it. JetBlue flew 1,079 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 2 points.

B6 519 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 519thin sample	300	74.6%	59 min	5.33%	C−
All JetBlue Airways on JFK–ATL	1,079	68.3%	71 min	3.99%	C−
All carriers on JFK–ATL	4,272	76.7%	77 min	2.25%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 519 quarter by quarter

B6 519 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.9% on time and its weakest Oct–Dec 2025 at 58.3%, a swing of 31 points on roughly 75 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 flights65.1%
Oct–Dec 202566 flights58.3%
Jan–Mar 202679 flights78.9%
Apr–Jun 202691 flights88.9%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 519 did best on Saturday at 80.6% on time and worst on Sunday at 63.4%. Each day rests on about 43 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 519 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,240 reported delay minutes.

Carrier
39%
Late-arriving aircraft
34%
National Airspace System
23%
Extreme weather
3%

34% 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 4,240 reported delay minutes here, that single category outweighs weather by 10 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 4,240 delay minutes reported on B6 519.

Cancellations run at 5.33%, against 1.81% nationally. That is about 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

7.0% 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 760 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 300 flights under B6 519 in the data flew JFK to ATL. 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. 300 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 519

For a booking, the cancellation rate is the figure to plan around on B6 519: 5.33% of its 300 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