Flight number record
F9 4891
Frontier Airlines · Atlanta to Las Vegas
- Route
- ATL → LAS
- Departs
- 10:30
- Flights
- 266
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 266 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.6%, so F9 4891 runs 11 points behind the country as a whole. Across a thousand flights that is about 112 extra late arrivals.
Key figures
On time
66.4%
Arrivals under 15 minutes late, of 259 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.26%
National rate is 1.81%
1 hour+ late
14.3%
National rate is 8.1%
These figures cover 266 flights between July 2025 and June 2026. Beyond the headline rate, 14.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When F9 4891 flies
F9 4891 flies ATL to LAS without a single fixed slot. Its most common scheduled departure was 10:30, used on 60 of 266 flights, with 11:15 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 10:3060 flights22.6%
- Departs 11:1535 flights13.2%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 10:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and F9 4891 runs 18 points worse at 66.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
F9 4891 next to ATL to LAS
Every carrier on ATL to LAS combined arrived on time 75.9% of the time across 4,796 flights, so F9 4891 is 10 points behind it. Frontier flew 562 flights on the same city pair under all its flight numbers, including this one, and those ran 63.3% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4891thin sample | 266 | 66.4% | 80 min | 2.26% | C |
| All Frontier Airlines on ATL–LAS | 562 | 63.3% | 88 min | 2.31% | D |
| All carriers on ATL–LAS | 4,796 | 75.9% | 60 min | 0.77% | B+ |
| Frontier Airlines, whole network | 205,332 | 73.2% | 84 min | 1.85% | 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 Jul–Sep 2025 at 60.7%, a swing of 19 points on roughly 67 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 202564 flights60.7%
- Oct–Dec 202554 flights79.2%
- Jan–Mar 202657 flights69.1%
- Apr–Jun 202691 flights61.1%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4891 did best on Thursday at 80.6% on time and worst on Monday at 48.6%. Each day rests on about 38 flights, so a gap of 32 points is worth noticing but could still narrow in another year.
Delay causes
Why F9 4891 runs late
One category carries most of the weight here. Carrier accounts for 54% of the 6,930 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 54%Carrier
- 38%Late-arriving aircraft
- 8%National Airspace System
- 1%Extreme weather
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 6,930 reported delay minutes here, that single category outweighs weather by 38 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 6,930 delay minutes reported on F9 4891.
Cancellations sit at 2.26% against a national 1.81%, which is ordinary. Diversions add another 0.38%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 266 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. 266 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. 14.3% 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 route78.1%
- Delta Air Lines 777 on the same route84.6%
- Delta Air Lines 919 on the same route73.5%
- Delta Air Lines 659 on the same route77.3%
- Delta Air Lines 466 on the same route78.6%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.