Flight number record
F9 4891
Frontier Airlines · Atlanta to Las Vegas
- Route
- ATL → LAS
- Departs
- 11:07
- Flights
- 273
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4891, check with Frontier Airlines.
F9 4891 draws a C. About 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 273 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so F9 4891 runs 10 points behind the country as a whole. Across a thousand flights that is about 98 extra late arrivals.
Key figures
On time
67.5%
Arrivals under 15 minutes late, of 268 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
1.83%
National rate is 1.89%
1 hour+ late
13.1%
National rate is 8.3%
These figures cover 273 flights between September 2025 and August 2026. Beyond the headline rate, 13.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4891 flies
F9 4891 flies ATL to LAS without a single fixed slot. Its most common scheduled departure was 11:07, used on 50 of 273 flights, with 11:15 (35 flights) next.
- Departs 11:0750 flights18.3%
- Departs 11:1535 flights12.8%
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 11:07 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and F9 4891 runs 11 points worse at 67.5%. 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 4891 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 4891 is 7 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 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4891thin sample | 273 | 67.5% | 80 min | 1.83% | C |
| 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 4891 quarter by quarter
F9 4891 did not run the same all year. Its best quarter was Oct–Dec 2025 at 79.2% on time and its weakest Apr–Jun 2026 at 61.1%, a swing of 18 points on roughly 68 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 20259 flights—
- Oct–Dec 202554 flights79.2%
- Jan–Mar 202657 flights69.1%
- Apr–Jun 202691 flights61.1%
- Jul–Sep 202662 flights67.2%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4891 did best on Sunday at 82.9% on time and worst on Monday at 51.3%. Each day rests on about 39 flights, so a gap of 32 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4891 runs when it is late
F9 4891 often beats the schedule: 72 of 268 completed flights, 27%, arrived 15 minutes or more early. The 87 late arrivals split 28 under half an hour, 24 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early72 flights26.9%
- Within 15 min109 flights40.7%
- 15–29 min late28 flights10.4%
- 30–59 min late24 flights9.0%
- 1–2 hours late21 flights7.8%
- 2+ hours late14 flights5.2%
Scale runs 0% to 100%.
Share of 268 completed flights by arrival against schedule.
A late pushback is often recovered here: of 116 departures that left 15 minutes late or more, 42 still arrived on time. 13 flights left on time and still arrived late.
The worst days
Worst days for F9 4891
The latest arrival of the period was on 15 June 2026, 10 hours 27 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 |
|---|---|---|
| 15 June 2026 | 10 hours 27 minutes | Carrier |
| 13 July 2026 | 9 hours 31 minutes | Carrier |
| 24 November 2025 | 5 hours 21 minutes | Carrier |
| 6 October 2025 | 4 hours 52 minutes | Carrier |
| 7 April 2026 | 4 hours 51 minutes | Late-arriving aircraft |
Delay causes
Why F9 4891 runs late
Carrier accounts for 55% of the 6,974 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 35%Late-arriving aircraft
- 10%National Airspace System
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,974 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 6,974 delay minutes reported on F9 4891.
Cancellations sit at 1.83% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
13.1% 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.
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 273 flights under F9 4891 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. 273 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 4891
For a booking, F9 4891 is a flight to put a long connection behind. 13.1% 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
- 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%
- Frontier Airlines 3923 on the same route57.0%
- 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.