Flight number record
F9 4405
Frontier Airlines · Miami to Atlanta
- Route
- MIA → ATL
- Departs
- 19:09
- Flights
- 336
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4405, check with Frontier Airlines.
F9 4405 earns an F, which is as low as this site's scale goes for a reason. Only 54.8% of flights arrive inside the 15-minute window, 23 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 336 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so F9 4405 runs 23 points behind the country as a whole. Across a thousand flights that is about 225 extra late arrivals.
Key figures
On time
54.8%
Arrivals under 15 minutes late, of 330 completed flights
Avg delay
93 min
Across delayed arrivals only, not all flights
Cancelled
1.49%
National rate is 1.89%
1 hour+ late
20.3%
National rate is 8.3%
These figures cover 336 flights between September 2025 and August 2026. Beyond the headline rate, 20.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4405 flies
F9 4405 flies MIA to ATL without a single fixed slot. Its most common scheduled departure was 19:09, used on 51 of 336 flights, with 17:28 (41 flights) and 17:22 (35 flights) next.
- Departs 19:0951 flights15.2%
- Departs 17:2841 flights12.2%
- Departs 17:2235 flights10.4%
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 19:09 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 4405 runs 13 points worse at 54.8%. 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 4405 next to MIA to ATL
Every carrier on MIA to ATL combined arrived on time 74.2% of the time across 6,271 flights, so F9 4405 is 19 points behind it. Frontier flew 933 flights on the same city pair under all its flight numbers, including this one, and those ran 69.7% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4405thin sample | 336 | 54.8% | 93 min | 1.49% | F |
| All Frontier Airlines on MIA–ATL | 933 | 69.7% | 84 min | 1.82% | C |
| All carriers on MIA–ATL | 6,271 | 74.2% | 82 min | 1.59% | C |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4405 quarter by quarter
F9 4405 did not run the same all year. Its best quarter was Jul–Sep 2025 at 73.3% on time and its weakest Jul–Sep 2026 at 36.1%, a swing of 37 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 202530 flights73.3%
- Oct–Dec 202578 flights63.2%
- Jan–Mar 202676 flights52.7%
- Apr–Jun 202690 flights56.2%
- Jul–Sep 202662 flights36.1%
Scale runs 30% to 80%.
By weekday, F9 4405 did best on Tuesday at 70.7% on time and worst on Sunday at 38.8%. Each day rests on about 48 flights, so a gap of 32 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4405 runs when it is late
F9 4405 often beats the schedule: 91 of 330 completed flights, 28%, arrived 15 minutes or more early. The 149 late arrivals split 38 under half an hour, 44 between 30 and 60 minutes, and 67 an hour or more.
- 15+ min early91 flights27.6%
- Within 15 min90 flights27.3%
- 15–29 min late38 flights11.5%
- 30–59 min late44 flights13.3%
- 1–2 hours late30 flights9.1%
- 2+ hours late37 flights11.2%
Scale runs 0% to 100%.
Share of 330 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 104 departures that left 15 minutes late or more, only 9 made it up before arrival. In the other direction, 54 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 ATL.
The worst days
Worst days for F9 4405
The latest arrival of the period was on 11 August 2026, 14 hours 31 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 August 2026 | 14 hours 31 minutes | Late-arriving aircraft |
| 2 December 2025 | 14 hours 25 minutes | Carrier |
| 9 March 2026 | 5 hours 7 minutes | Late-arriving aircraft |
| 15 February 2026 | 4 hours 45 minutes | Late-arriving aircraft |
| 22 May 2026 | 4 hours 40 minutes | Late-arriving aircraft |
Delay causes
Why F9 4405 runs late
Late-arriving aircraft accounts for 51% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 29%National Airspace System
- 17%Carrier
- 3%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 14,000 reported delay minutes here, that single category outweighs weather by 17 to one. The split is drawn from 13,835 delay minutes reported on F9 4405.
Cancellations sit at 1.49% against a national 1.89%, which is ordinary. Diversions add another 0.30%.
Connections and routes
What a delay on this flight costs
20.3% 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.
The 594 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 336 flights under F9 4405 in the data flew MIA to ATL. 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. 336 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 4405
For a booking, F9 4405 is a flight to put a long connection behind. 20.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- MIA to ATL, every carrier and departure
- ATL to MIA, the return direction
- Delta Air Lines 1510 on the same route83.5%
- Delta Air Lines 1332 on the same route73.7%
- Delta Air Lines 1261 on the same route93.1%
- Delta Air Lines 1211 on the same route92.5%
- Delta Air Lines 2836 on the same route87.0%
- Delta Air Lines 1386 on the same route58.1%
- Miami International (MIA) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.