Flight number record
F9 3801
Frontier Airlines · Las Vegas to San Francisco
- Route
- LAS → SFO
- Departs
- 18:00
- Flights
- 282
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3801, check with Frontier Airlines.
F9 3801 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 282 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so F9 3801 runs 17 points behind the country as a whole. Across a thousand flights that is about 172 extra late arrivals.
Key figures
On time
60.1%
Arrivals under 15 minutes late, of 276 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.13%
National rate is 1.89%
1 hour+ late
17.0%
National rate is 8.3%
These figures cover 282 flights between September 2025 and August 2026. Beyond the headline rate, 17.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When F9 3801 flies
F9 3801 flies LAS to SFO without a single fixed slot. Its most common scheduled departure was 18:00, used on 31 of 282 flights.
- Departs 18:0031 flights11.0%
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 18:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 3801 runs 8 points worse at 60.1%. 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 3801 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 3801 is 2 points ahead of 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 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3801thin sample | 282 | 60.1% | 80 min | 2.13% | D |
| 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 3801 quarter by quarter
F9 3801 did not run the same all year. Its best quarter was Jan–Mar 2026 at 73.1% on time and its weakest Jul–Sep 2026 at 36.8%, a swing of 36 points on roughly 71 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 202517 flights—
- Oct–Dec 202565 flights66.7%
- Jan–Mar 202652 flights73.1%
- Apr–Jun 202687 flights62.1%
- Jul–Sep 202661 flights36.8%
Scale runs 30% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3801 did best on Saturday at 71.4% on time and worst on Friday at 46.5%. Each day rests on about 40 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3801 runs when it is late
F9 3801 often beats the schedule: 72 of 276 completed flights, 26%, arrived 15 minutes or more early. The 110 late arrivals split 26 under half an hour, 37 between 30 and 60 minutes, and 47 an hour or more.
- 15+ min early72 flights26.1%
- Within 15 min94 flights34.1%
- 15–29 min late26 flights9.4%
- 30–59 min late37 flights13.4%
- 1–2 hours late28 flights10.1%
- 2+ hours late19 flights6.9%
Scale runs 0% to 100%.
Share of 276 completed flights by arrival against schedule.
15 of 111 late departures made up the time and arrived on time, 14% of them. In the other direction, 14 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 3801
The latest arrival of the period was on 4 August 2026, 18 hours 35 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 August 2026 | 18 hours 35 minutes | Extreme weather |
| 20 July 2026 | 7 hours 19 minutes | Late-arriving aircraft |
| 1 September 2025 | 5 hours 14 minutes | Late-arriving aircraft |
| 15 February 2026 | 3 hours 38 minutes | National Airspace System |
| 11 October 2025 | 3 hours 30 minutes | Late-arriving aircraft |
Delay causes
Why F9 3801 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 8,807 reported delay minutes.
- 39%National Airspace System
- 35%Late-arriving aircraft
- 13%Carrier
- 13%Extreme weather
Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 8,807 delay minutes reported on F9 3801.
Cancellations sit at 2.13% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
17.0% 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 282 flights under F9 3801 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. 282 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 3801
For a booking, F9 3801 is a flight to put a long connection behind. 17.0% 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%
- Frontier Airlines 4401 on the same route48.0%
- United Airlines 2047 on the same route67.7%
- United Airlines 1799 on the same route52.8%
- 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.