Carrier route record
F9MCO→ISP
Frontier Airlines · Orlando to Islip
- 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 MCO to ISP lands a B, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 360 flights. The strongest carrier on the route with a full sample, JetBlue Airways, flew 416 at 86.3% on time.
The US average over the same twelve months is 77.3%, so there is little to separate Frontier on MCO to ISP from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
81.0%
Arrivals under 15 minutes late, of 352 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
2.22%
National rate is 1.89%
Whole route
76.2%
Every carrier on MCO to ISP, 1,441 flights
These figures cover 360 flights between September 2025 and August 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.
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Carrier by carrier
Frontier against every carrier on MCO to ISP
Frontier flew 360 of the 1,441 flights on MCO to ISP, about 25% of it. Its 81.0% on time is 5 points better than the route as a whole, which runs 76.2%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from JetBlue at 86.3% to Southwest at 67.3%.
The choice of carrier is not cosmetic here. JetBlue Airways arrives on time 86.3% of the time; Southwest Airlines manages 67.3%. Sample sizes sit next to every figure, because a two-point gap across 665 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 416 | 86.3% | 69 min | 1.20% | A |
| Frontier Airlines (this page)thin sample | 360 | 81.0% | 62 min | 2.22% | B |
| Southwest Airlines | 665 | 67.3% | 52 min | 1.65% | C |
The spread between JetBlue and Southwest is 19 points, wide enough that it should decide the booking. On a hundred trips that is 19 more arrivals inside the on-time window.
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 24 points, against 19 points between the best and worst carrier.
- 5am–8am121 flights89.1%
- 8am–11am93 flights89.1%
- 11am–2pm27 flights—
- 2pm–5pm50 flights66.7%
- 5pm–8pm60 flights65.5%
- 8pm–5am9 flights—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.1% of the time, against 65.5% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 121 flights scheduled in it.
Across the year
Frontier on MCO to ISP through the year
- Jul–Sep 202530 flights96.7%
- Oct–Dec 2025104 flights82.4%
- Jan–Mar 202680 flights81.3%
- Apr–Jun 202693 flights72.8%
- Jul–Sep 202653 flights83.0%
Scale runs 65% to 100%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 81.0% on time across 360 flights.
Frontier on MCO to ISP did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Apr–Jun 2026 at 72.8%, a swing of 24 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, Tuesday is the strongest day at 93.8% on time and Sunday the weakest at 64.8%, a spread of 29 points.
Arrival by arrival
How late Frontier on MCO to ISP runs when it is late
Frontier on MCO to ISP often beats the schedule: 129 of 352 completed flights, 37%, arrived 15 minutes or more early. The 67 late arrivals split 21 under half an hour, 29 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early129 flights36.6%
- Within 15 min156 flights44.3%
- 15–29 min late21 flights6.0%
- 30–59 min late29 flights8.2%
- 1–2 hours late5 flights1.4%
- 2+ hours late12 flights3.4%
Scale runs 0% to 100%.
Share of 352 completed flights by arrival against schedule.
8 of 60 late departures made up the time and arrived on time, 13% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for Frontier on MCO to ISP
The latest arrival of the period was on 30 June 2026, 4 hours 33 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across June, November and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 June 2026 | 4 hours 33 minutes | Extreme weather |
| 27 June 2026 | 4 hours 28 minutes | Extreme weather |
| 9 November 2025 | 3 hours 36 minutes | Late-arriving aircraft |
| 10 November 2025 | 3 hours 34 minutes | Late-arriving aircraft |
| 6 April 2026 | 2 hours 58 minutes | National Airspace System |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 42% of the 4,133 delay minutes carriers reported here, and the remaining four split what is left.
- 42%Late-arriving aircraft
- 24%Carrier
- 18%National Airspace System
- 16%Extreme weather
Extreme weather accounts for 16% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.7 times the usual weather exposure. The split is drawn from 4,133 reported delay minutes.
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,133 reported delay minutes here, that single category outweighs weather by 3 to one.
Cancellations sit at 2.22% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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 74.9% on time across 360 flights, 6 points below 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 MCO to ISP
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 81.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 352 completed flights over 12 months sit behind that.
Related
Where to go next
- MCO to ISP, every carrier
- Frontier on ISP to MCO, the return leg
- JetBlue Airways on MCO to ISP86.3%
- Southwest Airlines on MCO to ISP67.3%
- Frontier Airlines network-wide record
- Orlando International (MCO) delay statistics
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.