Flight number record
F9 3923
Frontier Airlines · Atlanta to Las Vegas
- Route
- ATL → LAS
- Departs
- 19:11
- Flights
- 300
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3923, check with Frontier Airlines.
F9 3923 earns a D, which is as low as this site's scale goes for a reason. Only 57.0% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.3%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 300 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so F9 3923 runs 20 points behind the country as a whole. Across a thousand flights that is about 203 extra late arrivals.
Key figures
On time
57.0%
Arrivals under 15 minutes late, of 291 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
2.00%
National rate is 1.89%
1 hour+ late
21.0%
National rate is 8.3%
These figures cover 300 flights between September 2025 and August 2026. Beyond the headline rate, 21.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 3923 flies
F9 3923 flies ATL to LAS without a single fixed slot. Its most common scheduled departure was 19:11, used on 104 of 300 flights, with 20:50 (36 flights) next.
- Departs 19:11104 flights34.7%
- Departs 20:5036 flights12.0%
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 19:11 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 3923 runs 11 points worse at 57.0%. 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 3923 next to ATL to LAS
Every carrier on ATL to LAS combined arrived on time 74.8% of the time across 4,758 flights, so F9 3923 is 18 points behind it. Frontier flew 596 flights on the same city pair under all its flight numbers, including this one, and those ran 62.9% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3923thin sample | 300 | 57.0% | 103 min | 2.00% | D |
| All Frontier Airlines on ATL–LAS | 596 | 62.9% | 93 min | 1.85% | D |
| All carriers on ATL–LAS | 4,758 | 74.8% | 63 min | 0.78% | C+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3923 quarter by quarter
F9 3923 did not run the same all year. Its best quarter was Oct–Dec 2025 at 62.5% on time and its weakest Jul–Sep 2026 at 43.9%, a swing of 19 points on roughly 75 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 202518 flights—
- Oct–Dec 202565 flights62.5%
- Jan–Mar 202682 flights60.3%
- Apr–Jun 202677 flights59.5%
- Jul–Sep 202658 flights43.9%
Scale runs 35% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3923 did best on Saturday at 63.9% on time and worst on Monday at 44.0%. Each day rests on about 43 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3923 runs when it is late
F9 3923 often beats the schedule: 79 of 291 completed flights, 27%, arrived 15 minutes or more early. The 125 late arrivals split 24 under half an hour, 40 between 30 and 60 minutes, and 61 an hour or more.
- 15+ min early79 flights27.1%
- Within 15 min87 flights29.9%
- 15–29 min late24 flights8.2%
- 30–59 min late40 flights13.7%
- 1–2 hours late29 flights10.0%
- 2+ hours late32 flights11.0%
Scale runs 0% to 100%.
Share of 291 completed flights by arrival against schedule.
26 of 143 late departures made up the time and arrived on time, 18% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for F9 3923
The latest arrival of the period was on 21 August 2026, 13 hours 59 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 August 2026 | 13 hours 59 minutes | Carrier |
| 5 January 2026 | 13 hours | Carrier |
| 24 August 2026 | 10 hours 19 minutes | Late-arriving aircraft |
| 6 April 2026 | 8 hours 29 minutes | Carrier |
| 20 June 2026 | 6 hours 4 minutes | Carrier |
Delay causes
Why F9 3923 runs late
Late-arriving aircraft accounts for 57% of the 13,000 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Late-arriving aircraft
- 35%Carrier
- 8%National Airspace System
- 1%Extreme weather
57% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 57 to one. The split is drawn from 12,916 delay minutes reported on F9 3923.
Cancellations sit at 2.00% against a national 1.89%, which is ordinary. Diversions add another 1.00%.
Connections and routes
What a delay on this flight costs
21.0% 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.
At 1,747 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 300 flights under F9 3923 in the data flew ATL 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. 300 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 3923
For a booking, F9 3923 is a flight to put a long connection behind. 21.0% 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
- ATL to LAS, every carrier and departure
- LAS to ATL, the return direction
- Delta Air Lines 711 on the same route77.4%
- Delta Air Lines 549 on the same route76.9%
- Delta Air Lines 777 on the same route85.5%
- Delta Air Lines 659 on the same route77.6%
- Delta Air Lines 466 on the same route79.3%
- Delta Air Lines 919 on the same route74.7%
- Hartsfield-Jackson Atlanta International (ATL) 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.