Flight number record
F9 4401
Frontier Airlines · Las Vegas to San Francisco
- Route
- LAS → SFO
- Departs
- 14:48
- Flights
- 328
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4401, check with Frontier Airlines.
F9 4401 earns an F, which is as low as this site's scale goes for a reason. Only 48.0% of flights arrive inside the 15-minute window, 29 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 328 flights, with a median arrival 16 minutes late.
The national on-time rate over the same period is 77.3%, so F9 4401 runs 29 points behind the country as a whole. Across a thousand flights that is about 293 extra late arrivals.
Key figures
On time
48.0%
Arrivals under 15 minutes late, of 323 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
1.52%
National rate is 1.89%
1 hour+ late
20.1%
National rate is 8.3%
These figures cover 328 flights between September 2025 and August 2026. Beyond the headline rate, 20.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4401 flies
F9 4401 flies LAS to SFO without a single fixed slot. Its most common scheduled departure was 14:48, used on 40 of 328 flights, with 19:30 (35 flights) next.
- Departs 14:4840 flights12.2%
- Departs 19:3035 flights10.7%
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 14:48 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and F9 4401 runs 24 points worse at 48.0%. 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 4401 next to LAS to SFO
Every carrier on LAS to SFO combined arrived on time 58.0% of the time across 6,137 flights, so F9 4401 is 10 points behind it. Frontier flew 904 flights on the same city pair under all its flight numbers, including this one, and those ran 59.4% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 25 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4401thin sample | 328 | 48.0% | 74 min | 1.52% | F |
| All Frontier Airlines on LAS–SFO | 904 | 59.4% | 71 min | 1.66% | D |
| All carriers on LAS–SFO | 6,137 | 58.0% | 60 min | 0.77% | D+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4401 quarter by quarter
F9 4401 did not run the same all year. Its best quarter was Jan–Mar 2026 at 79.0% on time and its weakest Jul–Sep 2026 at 30.0%, a swing of 49 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 202530 flights50.0%
- Oct–Dec 202584 flights42.2%
- Jan–Mar 202666 flights79.0%
- Apr–Jun 202688 flights43.2%
- Jul–Sep 202660 flights30.0%
Scale runs 20% to 85%.
By weekday, F9 4401 did best on Saturday at 78.0% on time and worst on Friday at 39.2%. Each day rests on about 47 flights, so a gap of 39 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4401 runs when it is late
The 168 late arrivals split 40 under half an hour, 63 between 30 and 60 minutes, and 65 an hour or more.
- 15+ min early73 flights22.6%
- Within 15 min82 flights25.4%
- 15–29 min late40 flights12.4%
- 30–59 min late63 flights19.5%
- 1–2 hours late45 flights13.9%
- 2+ hours late20 flights6.2%
Scale runs 0% to 100%.
Share of 323 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 151 departures that left 15 minutes late or more, only 12 made it up before arrival. In the other direction, 29 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 SFO.
The worst days
Worst days for F9 4401
The latest arrival of the period was on 1 June 2026, 18 hours 12 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 |
|---|---|---|
| 1 June 2026 | 18 hours 12 minutes | Late-arriving aircraft |
| 7 December 2025 | 10 hours 40 minutes | Late-arriving aircraft |
| 10 May 2026 | 7 hours 13 minutes | Carrier |
| 14 August 2026 | 5 hours 41 minutes | Carrier |
| 20 April 2026 | 4 hours 8 minutes | Late-arriving aircraft |
Delay causes
Why F9 4401 runs late
National Airspace System accounts for 53% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 53%National Airspace System
- 33%Late-arriving aircraft
- 12%Carrier
- 2%Extreme weather
53% 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 6,614 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 12,418 delay minutes reported on F9 4401.
Cancellations sit at 1.52% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
20.1% 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 328 flights under F9 4401 in the data flew LAS to SFO. 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. 328 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 4401
For a booking, F9 4401 is a flight to put a long connection behind. 20.1% 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
- LAS to SFO, every carrier and departure
- SFO to LAS, the return direction
- United Airlines 574 on the same route66.1%
- United Airlines 2356 on the same route59.1%
- United Airlines 2047 on the same route67.7%
- United Airlines 1799 on the same route52.8%
- Frontier Airlines 3801 on the same route60.1%
- Alaska Airlines 634 on the same route53.9%
- Harry Reid International (LAS) delay statistics
- San Francisco International (SFO) 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.