Flight number record
F9 2858
Frontier Airlines · San Francisco to Los Angeles
- Route
- SFO → LAX
- Departs
- 20:23
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 2858, check with Frontier Airlines.
F9 2858 draws a D. 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 265 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so F9 2858 runs 13 points behind the country as a whole. Across a thousand flights that is about 127 extra late arrivals.
Key figures
On time
64.6%
Arrivals under 15 minutes late, of 260 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
1.89%
National rate is 1.89%
1 hour+ late
14.6%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 14.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 2858 flies
F9 2858 flies SFO to LAX without a single fixed slot. Its most common scheduled departure was 20:23, used on 57 of 265 flights, with 20:09 (28 flights) next.
- Departs 20:2357 flights21.5%
- Departs 20:0928 flights10.6%
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 20:23 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 2858 runs 6 points worse at 64.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 2858 next to SFO to LAX
Every carrier on SFO to LAX combined arrived on time 70.9% of the time across 11,437 flights, so F9 2858 is 6 points behind it. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 2858thin sample | 265 | 64.6% | 82 min | 1.89% | D |
| All Frontier Airlines on SFO–LAX | 394 | 66.5% | 77 min | 1.52% | C |
| All carriers on SFO–LAX | 11,437 | 70.9% | 58 min | 0.82% | C+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 2858 quarter by quarter
F9 2858 did not run the same all year. Its best quarter was Jan–Mar 2026 at 71.9% on time and its weakest Jul–Sep 2026 at 48.3%, a swing of 24 points on roughly 66 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 202510 flights—
- Oct–Dec 202575 flights69.9%
- Jan–Mar 202667 flights71.9%
- Apr–Jun 202653 flights67.9%
- Jul–Sep 202660 flights48.3%
Scale runs 40% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, F9 2858 did best on Saturday at 73.5% on time and worst on Sunday at 51.2%. Each day rests on about 38 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 2858 runs when it is late
The 92 late arrivals split 19 under half an hour, 35 between 30 and 60 minutes, and 38 an hour or more.
- 15+ min early56 flights21.5%
- Within 15 min112 flights43.1%
- 15–29 min late19 flights7.3%
- 30–59 min late35 flights13.5%
- 1–2 hours late23 flights8.8%
- 2+ hours late15 flights5.8%
Scale runs 0% to 100%.
Share of 260 completed flights by arrival against schedule.
11 of 91 late departures made up the time and arrived on time, 12% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for F9 2858
The latest arrival of the period was on 15 January 2026, 15 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in November 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 January 2026 | 15 hours 13 minutes | Carrier |
| 26 November 2025 | 11 hours 23 minutes | Late-arriving aircraft |
| 5 November 2025 | 4 hours 57 minutes | Late-arriving aircraft |
| 3 November 2025 | 4 hours 35 minutes | Late-arriving aircraft |
| 11 May 2026 | 3 hours 22 minutes | Carrier |
Delay causes
Why F9 2858 runs late
Late-arriving aircraft accounts for 67% of the 7,556 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Late-arriving aircraft
- 25%Carrier
- 8%National Airspace System
67% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,556 reported delay minutes here, that single category outweighs weather by 67 to one. The split is drawn from 7,556 delay minutes reported on F9 2858.
Cancellations sit at 1.89% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
14.6% 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.
Every one of the 265 flights under F9 2858 in the data flew SFO 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. 265 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 2858
For a booking, F9 2858 is a flight to put a long connection behind. 14.6% 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
- SFO to LAX, every carrier and departure
- LAX to SFO, the return direction
- Delta Air Lines 1598 on the same route93.4%
- Delta Air Lines 1421 on the same route89.7%
- Delta Air Lines 2267 on the same route49.2%
- United Airlines 2179 on the same route68.5%
- United Airlines 1754 on the same route71.8%
- Delta Air Lines 1715 on the same route56.1%
- San Francisco International (SFO) 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.