Flight number record

F9 1015

Frontier Airlines · San Juan to Philadelphia

Route: SJU → PHL
Departs: 01:59
Flights: 321
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 1015, check with Frontier Airlines.

F9 1015 draws a D−. Roughly one flight in two 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 321 flights, with a median arrival 7 minutes late.

The national on-time rate over the same period is 77.6%, so F9 1015 runs 18 points behind the country as a whole. Across a thousand flights that is about 180 extra late arrivals.

On time

59.6%

Arrivals under 15 minutes late, of 302 completed flights

Avg delay

97 min

Across delayed arrivals only, not all flights

Cancelled

5.61%

National rate is 1.81%

1 hour+ late

15.2%

National rate is 8.1%

These figures cover 321 flights between July 2025 and June 2026. Beyond the headline rate, 15.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 321 flights, with 00:59 (59 flights) and 06:30 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 01:59116 flights36.1%
Departs 00:5959 flights18.4%
Departs 06:3035 flights10.9%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and F9 1015 runs 11 points worse at 59.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

F9 1015 next to SJU to PHL

Every carrier on SJU to PHL combined arrived on time 70.5% of the time across 1,881 flights, so F9 1015 is 11 points behind it. Frontier flew 867 flights on the same city pair under all its flight numbers, including this one, and those ran 61.0% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 14 points.

F9 1015 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 1015thin sample	321	59.6%	97 min	5.61%	D−
All Frontier Airlines on SJU–PHL	867	61.0%	83 min	3.34%	D−
All carriers on SJU–PHL	1,881	70.5%	84 min	3.40%	C−
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	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 Jul–Sep 2025 at 39.4%, a swing of 42 points on roughly 80 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 202579 flights39.4%
Oct–Dec 202584 flights58.0%
Jan–Mar 202668 flights54.0%
Apr–Jun 202690 flights81.6%

Scale runs 30% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, F9 1015 did best on Wednesday at 71.4% on time and worst on Tuesday at 46.2%. Each day rests on about 46 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 1015 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 12,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
46%
Carrier
45%
National Airspace System
9%

46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 12,000 reported delay minutes here, that single category outweighs weather by 46 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 11,779 delay minutes reported on F9 1015.

Cancellations run at 5.61%, against 1.81% nationally. That is roughly one flight in twenty 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 321 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. 321 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: 5.61% of its 321 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures