Flight number record
F9 4612
Frontier Airlines · Las Vegas to Denver
- Route
- LAS → DEN
- Departs
- 21:20
- Flights
- 274
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4612, check with Frontier Airlines.
F9 4612 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 274 flights, with a median arrival 7 minutes early.
The national on-time rate over the same period is 77.3%, so F9 4612 runs 5 points behind the country as a whole. Across a thousand flights that is about 50 extra late arrivals.
Key figures
On time
72.3%
Arrivals under 15 minutes late, of 271 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
1.09%
National rate is 1.89%
1 hour+ late
13.3%
National rate is 8.3%
These figures cover 274 flights between September 2025 and August 2026. Beyond the headline rate, 13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4612 flies
F9 4612 flies LAS to DEN without a single fixed slot. Its most common scheduled departure was 21:20, used on 42 of 274 flights, with 20:59 (36 flights) next.
- Departs 21:2042 flights15.3%
- Departs 20:5936 flights13.1%
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 21:20 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 4612 runs 2 points better at 72.3%. 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 4612 next to LAS to DEN
Every carrier on LAS to DEN combined arrived on time 76.5% of the time across 7,140 flights, so F9 4612 is 4 points behind it. Frontier flew 1,620 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network Frontier Airlines managed 72.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4612thin sample | 274 | 72.3% | 85 min | 1.09% | C |
| All Frontier Airlines on LAS–DEN | 1,620 | 76.5% | 96 min | 1.17% | B |
| All carriers on LAS–DEN | 7,140 | 76.5% | 69 min | 0.83% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4612 quarter by quarter
Quarter by quarter F9 4612 held fairly steady: 79.0% in Oct–Dec 2025, 73.5% in Jan–Mar 2026 and 70.5% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202521 flights—
- Oct–Dec 202581 flights79.0%
- Jan–Mar 202668 flights73.5%
- Apr–Jun 202691 flights70.5%
- Jul–Sep 202613 flights—
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4612 did best on Tuesday at 87.5% on time and worst on Monday at 61.7%. Each day rests on about 39 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4612 runs when it is late
F9 4612 often beats the schedule: 106 of 271 completed flights, 39%, arrived 15 minutes or more early. The 75 late arrivals split 16 under half an hour, 23 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early106 flights39.1%
- Within 15 min90 flights33.2%
- 15–29 min late16 flights5.9%
- 30–59 min late23 flights8.5%
- 1–2 hours late20 flights7.4%
- 2+ hours late16 flights5.9%
Scale runs 0% to 100%.
Share of 271 completed flights by arrival against schedule.
18 of 91 late departures made up the time and arrived on time, 20% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for F9 4612
The latest arrival of the period was on 3 November 2025, 10 hours 58 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 10 hours 58 minutes | Late-arriving aircraft |
| 6 March 2026 | 4 hours 21 minutes | Late-arriving aircraft |
| 26 September 2025 | 3 hours 44 minutes | National Airspace System |
| 16 February 2026 | 3 hours 30 minutes | Late-arriving aircraft |
| 1 September 2025 | 3 hours 25 minutes | Late-arriving aircraft |
Delay causes
Why F9 4612 runs late
Late-arriving aircraft accounts for 69% of the 6,383 delay minutes carriers reported here, and the remaining four split what is left.
- 69%Late-arriving aircraft
- 22%Carrier
- 10%National Airspace System
69% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,383 reported delay minutes here, that single category outweighs weather by 69 to one. The split is drawn from 6,383 delay minutes reported on F9 4612.
Cancellations sit at 1.09% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
13.3% 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.
The 628 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 274 flights under F9 4612 in the data flew LAS to DEN. 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. 274 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 4612
For a booking, F9 4612 is a flight to put a long connection behind. 13.3% 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
- LAS to DEN, every carrier and departure
- DEN to LAS, the return direction
- United Airlines 596 on the same route97.8%
- Frontier Airlines 1994 on the same route77.4%
- Frontier Airlines 2350 on the same route88.4%
- United Airlines 2108 on the same route70.1%
- Frontier Airlines 3540 on the same route63.0%
- Harry Reid International (LAS) delay statistics
- Denver International (DEN) 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.