Flight number record

B6 1603

JetBlue Airways · New York to San Juan

Route: JFK → SJU
Departs: 08:50
Flights: 281
Period: July 2025 to June 2026

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

B6 1603 lands a B, 3 points 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 roughly 50 minutes on average. That is a workable record, not a spotless one. That rests on 281 flights, with a median arrival 10 minutes early.

On time

81.0%

Arrivals under 15 minutes late, of 273 completed flights

Avg delay

48 min

Across delayed arrivals only, not all flights

Cancelled

2.85%

National rate is 1.81%

1 hour+ late

5.1%

National rate is 8.1%

These figures cover 281 flights between July 2025 and June 2026. The median arrival is 10 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 1603 flies

B6 1603 flies JFK to SJU without a single fixed slot. Its most common scheduled departure was 08:50, used on 57 of 281 flights, with 05:05 (43 flights) and 06:00 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:5057 flights20.3%
Departs 05:0543 flights15.3%
Departs 06:0036 flights12.8%

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 08:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and B6 1603 runs 3 points worse at 81.0%. 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 1603 next to JFK to SJU

Every carrier on JFK to SJU combined arrived on time 71.1% of the time across 3,651 flights, so B6 1603 is 10 points ahead of it. JetBlue flew 2,232 flights on the same city pair under all its flight numbers, including this one, and those ran 69.5% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 8 points.

B6 1603 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1603thin sample	281	81.0%	48 min	2.85%	B
All JetBlue Airways on JFK–SJU	2,232	69.5%	74 min	2.91%	C
All carriers on JFK–SJU	3,651	71.1%	74 min	2.63%	C
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	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 2025 at 74.7%, a swing of 16 points on roughly 70 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 flights74.7%
Oct–Dec 202578 flights82.9%
Jan–Mar 202670 flights81.5%
Apr–Jun 202641 flights90.2%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1603 did best on Wednesday at 92.1% on time and worst on Sunday at 73.2%. Each day rests on about 40 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1603 runs late

One category carries most of the weight here. Carrier accounts for 48% of the 2,494 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.

Carrier
48%
National Airspace System
38%
Late-arriving aircraft
14%

38% 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 954 minutes out of 2,494, against a national NAS share of 21%. The split is drawn from 2,494 delay minutes reported on B6 1603.

Cancellations run at 2.85%, against 1.81% nationally. That is roughly 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

5.1% 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 roughly 50 minutes, 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: 2.85% of its 281 scheduled flights did not operate. A late arrival costs roughly 50 minutes, 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