Flight number record
F9 1203
Frontier Airlines · Philadelphia to Miami
- Route
- PHL → MIA
- Departs
- 17:25
- Flights
- 267
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 1203, check with Frontier Airlines.
F9 1203 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 267 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so F9 1203 runs 17 points behind the country as a whole. Across a thousand flights that is about 171 extra late arrivals.
Key figures
On time
60.2%
Arrivals under 15 minutes late, of 256 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
3.75%
National rate is 1.89%
1 hour+ late
17.6%
National rate is 8.3%
These figures cover 267 flights between September 2025 and August 2026. Beyond the headline rate, 17.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 1203 flies
F9 1203 flies PHL to MIA without a single fixed slot. Its most common scheduled departure was 17:25, used on 44 of 267 flights, with 17:32 (43 flights) next.
- Departs 17:2544 flights16.5%
- Departs 17:3243 flights16.1%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 1203 runs 8 points worse at 60.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 1203 next to PHL to MIA
Every carrier on PHL to MIA combined arrived on time 77.0% of the time across 3,286 flights, so F9 1203 is 17 points behind it. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 1203thin sample | 267 | 60.2% | 73 min | 3.75% | D− |
| All Frontier Airlines on PHL–MIA | 369 | 63.3% | 81 min | 2.98% | D |
| All carriers on PHL–MIA | 3,286 | 77.0% | 78 min | 2.86% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 1203 quarter by quarter
F9 1203 did not run the same all year. Its best quarter was Oct–Dec 2025 at 67.3% on time and its weakest Jul–Sep 2026 at 42.9%, a swing of 24 points on roughly 67 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.
- Jul–Sep 202513 flights—
- Oct–Dec 202552 flights67.3%
- Jan–Mar 202669 flights63.6%
- Apr–Jun 202672 flights65.3%
- Jul–Sep 202661 flights42.9%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, F9 1203 did best on Thursday at 62.2% on time and worst on Friday at 48.8%. Each day rests on about 38 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 1203 runs when it is late
F9 1203 often beats the schedule: 71 of 256 completed flights, 28%, arrived 15 minutes or more early. The 102 late arrivals split 23 under half an hour, 34 between 30 and 60 minutes, and 45 an hour or more.
- 15+ min early71 flights27.7%
- Within 15 min83 flights32.4%
- 15–29 min late23 flights9.0%
- 30–59 min late34 flights13.3%
- 1–2 hours late27 flights10.5%
- 2+ hours late18 flights7.0%
Scale runs 0% to 100%.
Share of 256 completed flights by arrival against schedule.
20 of 104 late departures made up the time and arrived on time, 19% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.
The worst days
Worst days for F9 1203
The latest arrival of the period was on 10 November 2025, 6 hours 13 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 November 2025 | 6 hours 13 minutes | Late-arriving aircraft |
| 26 April 2026 | 3 hours 59 minutes | Late-arriving aircraft |
| 5 December 2025 | 3 hours 49 minutes | Late-arriving aircraft |
| 19 October 2025 | 3 hours 18 minutes | Late-arriving aircraft |
| 22 November 2025 | 3 hours 14 minutes | Late-arriving aircraft |
Delay causes
Why F9 1203 runs late
Late-arriving aircraft accounts for 54% of the 7,406 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 26%Carrier
- 17%National Airspace System
- 3%Extreme weather
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,406 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 7,406 delay minutes reported on F9 1203.
Cancellations run at 3.75%, against 1.89% nationally. That is about one flight in 25 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 routes
What a delay on this flight costs
17.6% 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 1,013 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.
Every one of the 267 flights under F9 1203 in the data flew PHL to MIA. 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. 267 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 F9 1203
For a booking, the cancellation rate is the figure to plan around on F9 1203: 3.75% of its 267 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- PHL to MIA, every carrier and departure
- MIA to PHL, the return direction
- Philadelphia International (PHL) delay statistics
- Miami International (MIA) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Frontier Airlines’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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.