Carrier route record

F9ISP→MCO

Frontier Airlines · Islip to Orlando

Flights: 360
Period: September 2025 to August 2026
Share of route: 25%
Carriers: 3

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.

Frontier 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, 2 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 360 flights. The strongest carrier on the route with a full sample, JetBlue Airways, flew 416 at 76.7% on time.

The US average over the same twelve months is 77.3%, so there is little to separate Frontier 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

74.9%

Arrivals under 15 minutes late, of 347 completed flights

Avg delay

86 min

Across delayed arrivals only, not all flights

Cancelled

2.78%

National rate is 1.89%

Whole route

74.4%

Every carrier on ISP to MCO, 1,442 flights

These figures cover 360 flights between September 2025 and August 2026. Beyond the headline rate, 10.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Frontier against every carrier on ISP to MCO

Frontier flew 360 of the 1,442 flights on ISP to MCO, about 25% of it. Its 74.9% on time is about level with the route as a whole at 74.4%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from JetBlue at 76.7% to Southwest at 72.8%.

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	416	76.7%	85 min	1.68%	B
Frontier Airlines (this page)thin sample	360	74.9%	86 min	2.78%	C
Southwest Airlines	666	72.8%	59 min	1.50%	C

No carrier stands out. JetBlue tops the table at 76.7%, 4 points clear of the bottom, which is inside the range this kind of sample moves year to year.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Departure window

When Frontier runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against 4 points between the best and worst carrier.

5am–8am4 flights—
8am–11am43 flights85.0%
11am–2pm113 flights84.7%
2pm–5pm44 flights61.9%
5pm–8pm86 flights68.2%
8pm–5am70 flights69.2%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 85.0% of the time, against 61.9% for the afternoon window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 113 flights scheduled in it.

Across the year

Frontier on ISP to MCO through the year

Jul–Sep 202531 flights83.9%
Oct–Dec 2025103 flights68.7%
Jan–Mar 202680 flights76.7%
Apr–Jun 202693 flights74.7%
Jul–Sep 202653 flights79.2%

Scale runs 60% to 90%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 74.9% on time across 360 flights.

Frontier on ISP to MCO did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.9% on time and its weakest Oct–Dec 2025 at 68.7%, a swing of 15 points on roughly 72 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.

Across the week, Wednesday is the strongest day at 81.0% on time and Sunday the weakest at 58.0%, a spread of 23 points.

Arrival by arrival

How late Frontier on ISP to MCO runs when it is late

Frontier on ISP to MCO often beats the schedule: 143 of 347 completed flights, 41%, arrived 15 minutes or more early. The 87 late arrivals split 17 under half an hour, 34 between 30 and 60 minutes, and 36 an hour or more.

15+ min early143 flights41.2%
Within 15 min117 flights33.7%
15–29 min late17 flights4.9%
30–59 min late34 flights9.8%
1–2 hours late19 flights5.5%
2+ hours late17 flights4.9%

Scale runs 0% to 100%.

Share of 347 completed flights by arrival against schedule.

26 of 98 late departures made up the time and arrived on time, 27% of them. 15 flights left on time and still arrived late.

The worst days

Worst days for Frontier on ISP to MCO

The latest arrival of the period was on 22 August 2026, 12 hours 25 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.

The latest arrivals of Frontier on ISP to MCO in the period
Date	Arrived late by	Largest filed cause
22 August 2026	12 hours 25 minutes	Late-arriving aircraft
20 October 2025	5 hours 43 minutes	Carrier
9 November 2025	4 hours 31 minutes	Late-arriving aircraft
5 May 2026	4 hours 21 minutes	Carrier
30 June 2026	4 hours 9 minutes	Late-arriving aircraft

Delay causes

Why Frontier runs late on this route

Late-arriving aircraft accounts for 49% of the 7,509 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
49%
Carrier
27%
National Airspace System
23%
Extreme weather
0%

49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,509 reported delay minutes here, that single category outweighs weather by 49 to one. The split is drawn from 7,509 reported delay minutes.

The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 85.0% on time here.

Cancellations run at 2.78%, against 1.89% 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 stage length

What a delay here costs

10.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.

The return leg is a different operation and performs like one: it runs 81.0% on time across 360 flights, 6 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 6 points of difference.

One caution: this is a thin sample. 360 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 Frontier on ISP to MCO

Put together: treat all of this as provisional. 360 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 74.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 347 completed flights over 12 months sit behind that.

Where to go next

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