Carrier route record

B6ISP→MCO

JetBlue Airways · Islip to Orlando

Flights: 374
Period: July 2025 to June 2026
Share of route: 26%
Carriers: 3

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

JetBlue on ISP to MCO 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 a little over an hour behind schedule. That rests on 374 flights. The strongest carrier on the route with a full sample, Southwest Airlines, flew 678 at 73.4% on time.

The US average over the same twelve months is 77.6%, so there is little to separate JetBlue on ISP to MCO from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

74.5%

Arrivals under 15 minutes late, of 365 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

1.60%

National rate is 1.81%

Whole route

72.8%

Every carrier on ISP to MCO, 1,428 flights

These figures cover 374 flights between July 2025 and June 2026. Beyond the headline rate, 10.7% 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.

Carrier by carrier

JetBlue against every carrier on ISP to MCO

JetBlue flew 374 of the 1,428 flights on ISP to MCO, about 26% of it. Its 74.5% on time is 2 points better than the route as a whole, which runs 72.8%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from JetBlue at 74.5% to Frontier at 69.9%.

The two carriers here are closely matched: 4 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on ISP to MCO
Airline	Flights	On time	Avg delay	Cancelled	Grade
JetBlue Airways (this page)	374	74.5%	75 min	1.60%	C
Southwest Airlines	678	73.4%	62 min	1.47%	C
Frontier Airlines	376	69.9%	97 min	2.93%	C

No carrier stands out. Southwest tops the table at 73.4%, 4 points clear of the bottom, which is inside the range this kind of sample moves year to year.

Departure window

When JetBlue runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 13 points, against 4 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am—
8am–11am156 flights80.1%
11am–2pm81 flights69.6%
2pm–5pm91 flights74.2%
5pm–8pm45 flights66.7%
8pm–5am1 flights—

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 80.1% of the time, against 66.7% for the evening window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 156 flights scheduled in it.

Across the year

JetBlue on ISP to MCO through the year

Darker means more delays. Figures are on-time percentages.March best, August worst

August is the worst month at 56.7% on time, 37 points below March, the best at 93.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. June was the busiest month here, with 35 flights.

Across the week, Tuesday is the strongest day at 82.7% on time and Friday the weakest at 69.8%. 13 points is a smaller lever than departure hour, but it is free.

Delay causes

Why JetBlue runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 6,951 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
46%
National Airspace System
39%
Carrier
13%
Extreme weather
3%

46% 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 6,951 reported delay minutes here, that single category outweighs weather by 17 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 6,951 reported delay minutes.

39% 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 2,694 minutes out of 6,951, against a national NAS share of 21%.

Cancellations sit at 1.60% against a national 1.81%, which is ordinary. Diversions add another 0.80%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.7% 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 971 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.

The return leg is a different operation and performs like one: it runs 88.3% on time across 374 flights, 14 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 14 points of difference.

One caution: this is a thin sample. 374 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 JetBlue on ISP to MCO

Put together: treat all of this as provisional. 374 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 74.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 365 completed flights over 12 months sit behind that.

Where to go next

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