Flight number record

F9 4455

Frontier Airlines · Philadelphia to Fort Lauderdale

Route: PHL → FLL
Departs: 08:00
Flights: 256
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4455, check with Frontier Airlines.

F9 4455 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 256 flights, with a median arrival 8 minutes early.

The national on-time rate over the same period is 77.3%, so F9 4455 runs 5 points behind the country as a whole. Across a thousand flights that is about 54 extra late arrivals.

On time

71.9%

Arrivals under 15 minutes late, of 249 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

2.73%

National rate is 1.89%

1 hour+ late

12.0%

National rate is 8.3%

These figures cover 256 flights between September 2025 and August 2026. Beyond the headline rate, 12.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When F9 4455 flies

F9 4455 flies PHL to FLL without a single fixed slot. Its most common scheduled departure was 08:00, used on 48 of 256 flights, with 14:59 (44 flights) next.

Departs 08:0048 flights18.8%
Departs 14:5944 flights17.2%

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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and F9 4455 runs 12 points worse at 71.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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 4455 next to PHL to FLL

Every carrier on PHL to FLL combined arrived on time 73.1% of the time across 3,588 flights, so F9 4455 is about level with it. Frontier flew 659 flights on the same city pair under all its flight numbers, including this one, and those ran 72.4% on time. Across its whole network Frontier Airlines managed 72.7%, close to this flight's figure.

F9 4455 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 4455thin sample	256	71.9%	79 min	2.73%	C
All Frontier Airlines on PHL–FLL	659	72.4%	82 min	2.28%	C
All carriers on PHL–FLL	3,588	73.1%	77 min	3.26%	C−
Frontier Airlines, whole network	213,022	72.7%	84 min	2.05%	C

Across the year

F9 4455 quarter by quarter

F9 4455 did not run the same all year. Its best quarter was Oct–Dec 2025 at 81.7% on time and its weakest Jan–Mar 2026 at 54.5%, a swing of 27 points on roughly 64 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 202560 flights81.7%
Jan–Mar 202647 flights54.5%
Apr–Jun 202666 flights78.8%
Jul–Sep 202662 flights58.6%

Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, F9 4455 did best on Saturday at 78.6% on time and worst on Sunday at 59.0%. Each day rests on about 37 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late F9 4455 runs when it is late

F9 4455 often beats the schedule: 97 of 249 completed flights, 39%, arrived 15 minutes or more early. The 70 late arrivals split 18 under half an hour, 22 between 30 and 60 minutes, and 30 an hour or more.

15+ min early97 flights39.0%
Within 15 min82 flights32.9%
15–29 min late18 flights7.2%
30–59 min late22 flights8.8%
1–2 hours late16 flights6.4%
2+ hours late14 flights5.6%

Scale runs 0% to 100%.

Share of 249 completed flights by arrival against schedule.

13 of 65 late departures made up the time and arrived on time, 20% 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 FLL.

The worst days

Worst days for F9 4455

The latest arrival of the period was on 26 January 2026, 6 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across January, November, December and August, with no single month standing out.

The latest arrivals of F9 4455 in the period
Date	Arrived late by	Largest filed cause
26 January 2026	6 hours 21 minutes	Carrier
8 November 2025	4 hours 2 minutes	National Airspace System
26 December 2025	3 hours 52 minutes	National Airspace System
24 August 2026	3 hours 51 minutes	Late-arriving aircraft
27 August 2026	3 hours 41 minutes	Carrier

Delay causes

Why F9 4455 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,525 reported delay minutes.

National Airspace System
34%
Late-arriving aircraft
32%
Carrier
31%
Extreme weather
3%

34% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,891 minutes out of 5,525, against a national NAS share of 21%. The split is drawn from 5,525 delay minutes reported on F9 4455.

Cancellations run at 2.73%, against 1.89% nationally. That is roughly one flight in 40 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

12.0% 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 993 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 256 flights under F9 4455 in the data flew PHL to FLL. 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. 256 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 4455

For a booking, the cancellation rate is the figure to plan around on F9 4455: 2.73% of its 256 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.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures