Flight number record

B6 1603

JetBlue Airways · New York to San Juan

Route: JFK → SJU
Departs: 08:29
Flights: 281
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s B6 1603, check with JetBlue Airways.

B6 1603 sits in the middle of the pack with a B−. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 281 flights, with a median arrival 6 minutes early.

On time

75.6%

Arrivals under 15 minutes late, of 271 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

3.56%

National rate is 1.89%

1 hour+ late

8.1%

National rate is 8.3%

These figures cover 281 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When B6 1603 flies

B6 1603 flies JFK to SJU without a single fixed slot. Its most common scheduled departure was 08:29, used on 57 of 281 flights, with 05:05 (43 flights) and 06:00 (36 flights) next.

Departs 08:2957 flights20.3%
Departs 05:0543 flights15.3%
Departs 06:0036 flights12.8%

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 08:29 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and B6 1603 runs 8 points worse at 75.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

B6 1603 next to JFK to SJU

Every carrier on JFK to SJU combined arrived on time 70.2% of the time across 3,554 flights, so B6 1603 is 5 points ahead of it. JetBlue flew 2,245 flights on the same city pair under all its flight numbers, including this one, and those ran 67.7% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 4 points.

B6 1603 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1603thin sample	281	75.6%	72 min	3.56%	B−
All JetBlue Airways on JFK–SJU	2,245	67.7%	78 min	4.14%	C−
All carriers on JFK–SJU	3,554	70.2%	78 min	3.57%	C−
JetBlue Airways, whole network	240,615	71.3%	77 min	3.56%	C−

Across the year

B6 1603 quarter by quarter

B6 1603 did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.2% on time and its weakest Jul–Sep 2026 at 52.5%, a swing of 38 points on roughly 56 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 202578 flights82.9%
Jan–Mar 202670 flights81.5%
Apr–Jun 202641 flights90.2%
Jul–Sep 202662 flights52.5%

Scale runs 45% to 95%.

By weekday, B6 1603 did best on Wednesday at 86.8% on time and worst on Thursday at 67.5%. Each day rests on about 40 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late B6 1603 runs when it is late

B6 1603 often beats the schedule: 83 of 271 completed flights, 31%, arrived 15 minutes or more early. The 66 late arrivals split 21 under half an hour, 23 between 30 and 60 minutes, and 22 an hour or more.

15+ min early83 flights30.6%
Within 15 min122 flights45.0%
15–29 min late21 flights7.7%
30–59 min late23 flights8.5%
1–2 hours late10 flights3.7%
2+ hours late12 flights4.4%

Scale runs 0% to 100%.

Share of 271 completed flights by arrival against schedule.

A late pushback is often recovered here: of 62 departures that left 15 minutes late or more, 20 still arrived on time. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SJU.

The worst days

Worst days for B6 1603

The latest arrival of the period was on 3 August 2026, 6 hours 49 minutes behind schedule; most of its delay minutes were filed as extreme weather. Four of the five worst days fell in July 2026.

The latest arrivals of B6 1603 in the period
Date	Arrived late by	Largest filed cause
3 August 2026	6 hours 49 minutes	Extreme weather
11 July 2026	4 hours 27 minutes	National Airspace System
8 July 2026	4 hours 11 minutes	Carrier
23 July 2026	4 hours 5 minutes	National Airspace System
12 July 2026	3 hours 40 minutes	Late-arriving aircraft

Delay causes

Why B6 1603 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 4,735 reported delay minutes.

National Airspace System
37%
Late-arriving aircraft
29%
Carrier
28%
Extreme weather
7%

37% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,757 minutes out of 4,735, against a national NAS share of 21%. The split is drawn from 4,735 delay minutes reported on B6 1603.

Cancellations run at 3.56%, against 1.89% nationally. That is about one flight in 30 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

8.1% 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 a little over an hour, which a normal layover absorbs.

At 1,598 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 281 flights under B6 1603 in the data flew JFK to SJU. 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. 281 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 1603

For a booking, the cancellation rate is the figure to plan around on B6 1603: 3.56% of its 281 scheduled flights did not operate. A late arrival costs a little over 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures