Flight number record
F9 1015
Frontier Airlines · San Juan to Philadelphia
- Route
- SJU → PHL
- Departs
- 01:59
- Flights
- 325
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 1015, check with Frontier Airlines.
F9 1015 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 325 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so F9 1015 runs 11 points behind the country as a whole. Across a thousand flights that is about 112 extra late arrivals.
Key figures
On time
66.1%
Arrivals under 15 minutes late, of 310 completed flights
Avg delay
97 min
Across delayed arrivals only, not all flights
Cancelled
4.31%
National rate is 1.89%
1 hour+ late
12.3%
National rate is 8.3%
These figures cover 325 flights between September 2025 and August 2026. Beyond the headline rate, 12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 1015 flies
F9 1015 flies SJU to PHL without a single fixed slot. Its most common scheduled departure was 01:59, used on 116 of 325 flights, with 06:44 (84 flights) and 06:30 (35 flights) next.
- Departs 01:59116 flights35.7%
- Departs 06:4484 flights25.8%
- Departs 06:3035 flights10.8%
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 01:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 1015 runs 4 points worse at 66.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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.
Against the route
F9 1015 next to SJU to PHL
Every carrier on SJU to PHL combined arrived on time 71.9% of the time across 1,992 flights, so F9 1015 is 6 points behind it. Frontier flew 916 flights on the same city pair under all its flight numbers, including this one, and those ran 63.3% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 1015thin sample | 325 | 66.1% | 97 min | 4.31% | C− |
| All Frontier Airlines on SJU–PHL | 916 | 63.3% | 81 min | 3.17% | D− |
| All carriers on SJU–PHL | 1,992 | 71.9% | 85 min | 3.61% | C− |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 1015 quarter by quarter
F9 1015 did not run the same all year. Its best quarter was Apr–Jun 2026 at 81.6% on time and its weakest Jan–Mar 2026 at 54.0%, a swing of 28 points on roughly 81 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 202521 flights—
- Oct–Dec 202584 flights58.0%
- Jan–Mar 202668 flights54.0%
- Apr–Jun 202690 flights81.6%
- Jul–Sep 202662 flights69.0%
Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 1015 did best on Thursday at 75.0% on time and worst on Tuesday at 50.0%. Each day rests on about 46 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 1015 runs when it is late
F9 1015 often beats the schedule: 88 of 310 completed flights, 28%, arrived 15 minutes or more early. The 105 late arrivals split 38 under half an hour, 29 between 30 and 60 minutes, and 38 an hour or more.
- 15+ min early88 flights28.4%
- Within 15 min117 flights37.7%
- 15–29 min late38 flights12.3%
- 30–59 min late29 flights9.4%
- 1–2 hours late22 flights7.1%
- 2+ hours late16 flights5.2%
Scale runs 0% to 100%.
Share of 310 completed flights by arrival against schedule.
11 of 85 late departures made up the time and arrived on time, 13% of them. In the other direction, 31 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 PHL.
The worst days
Worst days for F9 1015
The latest arrival of the period was on 5 April 2026, 12 hours 37 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 April 2026 | 12 hours 37 minutes | Carrier |
| 31 July 2026 | 10 hours 49 minutes | Late-arriving aircraft |
| 18 July 2026 | 10 hours 24 minutes | Late-arriving aircraft |
| 2 December 2025 | 8 hours 48 minutes | Late-arriving aircraft |
| 8 December 2025 | 8 hours 45 minutes | Late-arriving aircraft |
Delay causes
Why F9 1015 runs late
Late-arriving aircraft accounts for 55% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Late-arriving aircraft
- 34%Carrier
- 10%National Airspace System
- 1%Extreme weather
55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 10,000 reported delay minutes here, that single category outweighs weather by 55 to one. The split is drawn from 10,205 delay minutes reported on F9 1015.
Cancellations run at 4.31%, 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
12.3% 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.
At 1,576 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 325 flights under F9 1015 in the data flew SJU to PHL. 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. 325 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 1015
For a booking, the cancellation rate is the figure to plan around on F9 1015: 4.31% of its 325 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SJU to PHL, every carrier and departure
- PHL to SJU, the return direction
- Frontier Airlines 1165 on the same route58.4%
- Luis Munoz Marin International (SJU) delay statistics
- Philadelphia International (PHL) 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.