Flight number record
F9 4315
Frontier Airlines · Atlanta to Los Angeles
- Route
- ATL → LAX
- Departs
- 10:35
- Flights
- 292
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4315, check with Frontier Airlines.
F9 4315 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 292 flights, with a median arrival 3 minutes early.
Key figures
On time
73.8%
Arrivals under 15 minutes late, of 286 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
2.05%
National rate is 1.89%
1 hour+ late
9.4%
National rate is 8.3%
These figures cover 292 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4315 flies
F9 4315 flies ATL to LAX without a single fixed slot. Its most common scheduled departure was 10:35, used on 49 of 292 flights, with 10:30 (47 flights) next.
- Departs 10:3549 flights16.8%
- Departs 10:3047 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 10:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and F9 4315 runs 10 points worse at 73.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
F9 4315 next to ATL to LAX
Every carrier on ATL to LAX combined arrived on time 77.8% of the time across 4,851 flights, so F9 4315 is 4 points behind it. Frontier flew 490 flights on the same city pair under all its flight numbers, including this one, and those ran 70.5% on time. Across its whole network Frontier Airlines managed 72.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4315thin sample | 292 | 73.8% | 66 min | 2.05% | C |
| All Frontier Airlines on ATL–LAX | 490 | 70.5% | 61 min | 1.63% | C |
| All carriers on ATL–LAX | 4,851 | 77.8% | 65 min | 0.82% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4315 quarter by quarter
F9 4315 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jan–Mar 2026 at 67.4%, a swing of 19 points on roughly 73 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 flights86.7%
- Oct–Dec 202577 flights80.3%
- Jan–Mar 202690 flights67.4%
- Apr–Jun 202691 flights69.0%
- Jul–Sep 20264 flights—
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4315 did best on Wednesday at 88.6% on time and worst on Friday at 60.0%. Each day rests on about 42 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4315 runs when it is late
F9 4315 often beats the schedule: 92 of 286 completed flights, 32%, arrived 15 minutes or more early. The 75 late arrivals split 30 under half an hour, 18 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early92 flights32.2%
- Within 15 min119 flights41.6%
- 15–29 min late30 flights10.5%
- 30–59 min late18 flights6.3%
- 1–2 hours late16 flights5.6%
- 2+ hours late11 flights3.8%
Scale runs 0% to 100%.
Share of 286 completed flights by arrival against schedule.
A late pushback is often recovered here: of 119 departures that left 15 minutes late or more, 51 still arrived on time. 7 flights left on time and still arrived late.
The worst days
Worst days for F9 4315
The latest arrival of the period was on 16 March 2026, 5 hours 32 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 5 hours 32 minutes | Late-arriving aircraft |
| 7 December 2025 | 5 hours 7 minutes | Carrier |
| 21 January 2026 | 5 hours 2 minutes | Late-arriving aircraft |
| 30 November 2025 | 3 hours 56 minutes | Carrier |
| 27 June 2026 | 2 hours 59 minutes | Late-arriving aircraft |
Delay causes
Why F9 4315 runs late
Carrier accounts for 48% of the 4,922 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 42%Late-arriving aircraft
- 10%National Airspace System
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,922 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 4,922 delay minutes reported on F9 4315.
Cancellations sit at 2.05% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
9.4% 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 1,947 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 292 flights under F9 4315 in the data flew ATL to LAX. 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. 292 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 4315
For a booking, read F9 4315 as 73.8% on time with 2.05% cancelled over 292 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to LAX, every carrier and departure
- LAX to ATL, the return direction
- Delta Air Lines 895 on the same route87.6%
- Delta Air Lines 898 on the same route89.0%
- Delta Air Lines 501 on the same route85.0%
- Delta Air Lines 996 on the same route88.6%
- Delta Air Lines 500 on the same route74.0%
- Delta Air Lines 753 on the same route82.4%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Los Angeles International (LAX) 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.