Flight number record
F9 4158
Frontier Airlines · San Francisco to Las Vegas
- Route
- SFO → LAS
- Departs
- 11:20
- Flights
- 279
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4158, check with Frontier Airlines.
F9 4158 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 279 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so F9 4158 runs 16 points behind the country as a whole. Across a thousand flights that is about 164 extra late arrivals.
Key figures
On time
60.9%
Arrivals under 15 minutes late, of 276 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
1.08%
National rate is 1.89%
1 hour+ late
13.8%
National rate is 8.3%
These figures cover 279 flights between September 2025 and August 2026. Beyond the headline rate, 13.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4158 flies
F9 4158 flies SFO to LAS without a single fixed slot. Its most common scheduled departure was 11:20, used on 50 of 279 flights, with 05:45 (45 flights) and 08:00 (29 flights) next.
- Departs 11:2050 flights17.9%
- Departs 05:4545 flights16.1%
- Departs 08:0029 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 11:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and F9 4158 runs 17 points worse at 60.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
F9 4158 next to SFO to LAS
Every carrier on SFO to LAS combined arrived on time 70.2% of the time across 6,140 flights, so F9 4158 is 9 points behind it. Frontier flew 906 flights on the same city pair under all its flight numbers, including this one, and those ran 60.0% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4158thin sample | 279 | 60.9% | 61 min | 1.08% | D |
| All Frontier Airlines on SFO–LAS | 906 | 60.0% | 87 min | 1.77% | D |
| All carriers on SFO–LAS | 6,140 | 70.2% | 65 min | 0.70% | C+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4158 quarter by quarter
F9 4158 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 29.8%, a swing of 64 points on roughly 56 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 flights93.3%
- Oct–Dec 202575 flights89.3%
- Jan–Mar 202652 flights63.5%
- Apr–Jun 202663 flights37.1%
- Jul–Sep 202659 flights29.8%
Scale runs 20% to 100%.
By weekday, F9 4158 did best on Saturday at 85.7% on time and worst on Tuesday at 43.3%. Each day rests on about 40 flights, so a gap of 42 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4158 runs when it is late
F9 4158 often beats the schedule: 79 of 276 completed flights, 29%, arrived 15 minutes or more early. The 108 late arrivals split 23 under half an hour, 47 between 30 and 60 minutes, and 38 an hour or more.
- 15+ min early79 flights28.6%
- Within 15 min89 flights32.2%
- 15–29 min late23 flights8.3%
- 30–59 min late47 flights17.0%
- 1–2 hours late29 flights10.5%
- 2+ hours late9 flights3.3%
Scale runs 0% to 100%.
Share of 276 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 106 departures that left 15 minutes late or more, only 8 made it up before arrival. 10 flights left on time and still arrived late.
The worst days
Worst days for F9 4158
The latest arrival of the period was on 10 May 2026, 6 hours 46 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 |
|---|---|---|
| 10 May 2026 | 6 hours 46 minutes | Late-arriving aircraft |
| 19 May 2026 | 4 hours 43 minutes | Carrier |
| 15 February 2026 | 3 hours 5 minutes | Late-arriving aircraft |
| 18 June 2026 | 3 hours 5 minutes | National Airspace System |
| 2 August 2026 | 2 hours 54 minutes | Late-arriving aircraft |
Delay causes
Why F9 4158 runs late
Late-arriving aircraft accounts for 71% of the 6,607 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Late-arriving aircraft
- 15%National Airspace System
- 13%Carrier
- 1%Extreme weather
71% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,607 reported delay minutes here, that single category outweighs weather by 71 to one. The split is drawn from 6,607 delay minutes reported on F9 4158.
Cancellations sit at 1.08% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
13.8% 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 279 flights under F9 4158 in the data flew SFO to LAS. 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. 279 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 4158
For a booking, F9 4158 is a flight to put a long connection behind. 13.8% 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 LAS, every carrier and departure
- LAS to SFO, the return direction
- United Airlines 1995 on the same route79.4%
- United Airlines 751 on the same route68.8%
- United Airlines 406 on the same route76.3%
- Alaska Airlines 776 on the same route59.2%
- United Airlines 611 on the same route76.1%
- Alaska Airlines 718 on the same route87.5%
- San Francisco International (SFO) delay statistics
- Harry Reid International (LAS) 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.