Flight number record

B6 1604

JetBlue Airways · San Juan to New York

Route: SJU → JFK
Departs: 13:50
Flights: 347
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 1604, check with JetBlue Airways.

B6 1604 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 347 flights, with a median arrival 10 minutes early.

Set against the rest of the country, B6 1604's record is 7 points better than the US average of 77.6%. That gap is worth roughly 70 fewer late arrivals for every thousand flights.

On time

84.6%

Arrivals under 15 minutes late, of 338 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

2.31%

National rate is 1.81%

1 hour+ late

7.1%

National rate is 8.1%

These figures cover 347 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 1604 flies

B6 1604 flies SJU to JFK without a single fixed slot. Its most common scheduled departure was 13:50, used on 63 of 347 flights, with 14:25 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:5063 flights18.2%
Departs 14:2550 flights14.4%

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 13:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and B6 1604 runs 6 points better at 84.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 1604 next to SJU to JFK

Every carrier on SJU to JFK combined arrived on time 79.3% of the time across 3,657 flights, so B6 1604 is 5 points ahead of it. JetBlue flew 2,237 flights on the same city pair under all its flight numbers, including this one, and those ran 75.0% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 12 points.

B6 1604 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 1604thin sample	347	84.6%	62 min	2.31%	B
All JetBlue Airways on SJU–JFK	2,237	75.0%	78 min	3.22%	B−
All carriers on SJU–JFK	3,657	79.3%	77 min	2.68%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 1604 quarter by quarter

Quarter by quarter B6 1604 held fairly steady: 81.3% in Jul–Sep 2025, 89.0% in Oct–Dec 2025, 85.5% in Jan–Mar 2026 and 82.2% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights81.3%
Oct–Dec 202591 flights89.0%
Jan–Mar 202690 flights85.5%
Apr–Jun 202674 flights82.2%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, B6 1604 did best on Friday at 91.8% on time and worst on Saturday at 77.1%. Each day rests on about 50 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 1604 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 3,203 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
45%
Carrier
43%
National Airspace System
12%

45% 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 3,203 reported delay minutes here, that single category outweighs weather by 45 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 3,203 delay minutes reported on B6 1604.

Cancellations sit at 2.31% against a national 1.81%, which is ordinary. Diversions add another 0.29%.

Connections and routes

What a delay on this flight costs

7.1% 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 about 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 347 flights under B6 1604 in the data flew SJU to JFK. 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. 347 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 1604

For a booking, read B6 1604 as 84.6% on time with 2.31% cancelled over 347 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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