Flight profile · Frontier Airlines
F91577
Philadelphia (PHL) to Fort Myers (RSW) · scheduled 6:00 AM – 8:44 AM
How F91577 performs
617 operations, November 2023 – June 2026.
F91577 arrived on time 71.8% of the time, against 74.2% for all PHL → RSW flights, so this departure is 2.4 percentage points worse than the route as a whole. Against Frontier Airlines’ own flights on this route it is 1.7 points better.
Source: US DOT Bureau of Transportation Statistics · 617 operations, November 2023 – June 2026 · If F91577 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where F91577 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| F91577 | 71.8% | 2.27% | -5 min | 10.9% | 617 |
| Frontier Airlines on PHL → RSW | 70.1% | 3.55% | -5 min | 12.2% | 1,183 |
| All PHL → RSW flights | 74.2% | 2.35% | -5 min | 10.4% | 4,335 |
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – June 2026
Why F91577 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for F91577 on PHL → RSW. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – June 2026
Does a late aircraft delay this flight?
How often the plane that flies F91577 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, F91577 pushed back an average of 25 minutes late; when it came in on time or early, an average of 4 minutes late.
Each departure is matched to the flight the same aircraft flew into PHL just before it, using the tail number in the DOT file, 522 of 603 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| F91577 | 38% | 44% | 13% |
| Network, same turn | 33% | 24% | 11% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 3 to 6 hours. How often F91577’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often F91577 left 15 or more minutes late is higher than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – June 2026
From pushback to gate
When it leaves PHL late, does that still matter by the time it reaches RSW?
F91577 pushes back an average of 15.1 minutes late and reaches the gate at RSW an average of 11.4 minutes late. The 3.6 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 23.4 minutes on the taxiways at PHL, 5.6 minutes longer than a typical PHL departure in the same hour.
On arrival at RSW, F91577 spends 9.6 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 4.0 minutes longer than a typical RSW arrival (5.6 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached RSW. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 19,016 departures from PHL scheduled in the clock hour F91577 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at RSW (107,489 flights), not just F91577’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – June 2026
The hour it leaves PHL
Part of any flight’s record belongs to the clock rather than to the flight. F91577 has one departure time, so this is what that time is worth.
On-time arrival rate. 19,016 departures from PHL are scheduled in the 6 AM–7 AM hour over the period, against 305,181 across the whole day.
F91577 is scheduled out of PHL at 6:00 AM, in the 6 AM–7 AM bank. Departures from PHL in that hour arrive on time 87.0% of the time against 76.2% across the airport’s whole day — the slot alone is worth 10.8 points better before anything about this particular flight is considered.
The two airport figures cover every departure from PHL to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – June 2026 · Hours below 120 departures are not scored.
Other routes F91577 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ORD→ATL Chicago to Atlanta | July 6, 2023 – November 15, 2023 | 42 | — |
Because the same number has served different journeys, the statistics above describe only the route F91577 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
66 min late
against a median of 5 min early
F91577 has an average that understates its risk: a typical arrival is 5 min early, but the worst tenth are 71 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 617 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – June 2026
Data and methodology
Calculated by FlyerIntel from 617 records of F91577 operating PHL → RSW, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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