Flight number record
F9 4612
Frontier Airlines · Las Vegas to Denver
- Route
- LAS → DEN
- Departs
- 21:20
- Flights
- 294
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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, 7 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 294 flights, with a median arrival 7 minutes early.
The national on-time rate over the same period is 77.6%, so F9 4612 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.
Key figures
On time
71.1%
Arrivals under 15 minutes late, of 291 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
1.02%
National rate is 1.81%
1 hour+ late
14.4%
National rate is 8.1%
These figures cover 294 flights between July 2025 and June 2026. Beyond the headline rate, 14.4% 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 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 294 flights, with 20:59 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 21:2042 flights14.3%
- Departs 20:5935 flights11.9%
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 21:20 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and F9 4612 runs level with that at 71.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
F9 4612 next to LAS to DEN
Every carrier on LAS to DEN combined arrived on time 77.0% of the time across 7,088 flights, so F9 4612 is 6 points behind it. Frontier flew 1,554 flights on the same city pair under all its flight numbers, including this one, and those ran 79.1% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4612thin sample | 294 | 71.1% | 90 min | 1.02% | C |
| All Frontier Airlines on LAS–DEN | 1,554 | 79.1% | 90 min | 0.97% | B+ |
| All carriers on LAS–DEN | 7,088 | 77.0% | 66 min | 0.87% | B+ |
| Frontier Airlines, whole network | 205,332 | 73.2% | 84 min | 1.85% | C |
Across the year
F9 4612 quarter by quarter
F9 4612 did not run the same all year. Its best quarter was Oct–Dec 2025 at 79.0% on time and its weakest Jul–Sep 2025 at 57.4%, a swing of 22 points on roughly 74 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 202554 flights57.4%
- Oct–Dec 202581 flights79.0%
- Jan–Mar 202668 flights73.5%
- Apr–Jun 202691 flights70.5%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4612 did best on Tuesday at 87.1% on time and worst on Thursday at 64.0%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Delay causes
Why F9 4612 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 70% of the 7,536 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.
- 70%Late-arriving aircraft
- 20%Carrier
- 10%National Airspace System
70% 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 7,536 reported delay minutes here, that single category outweighs weather by 70 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 7,536 delay minutes reported on F9 4612.
Cancellations sit at 1.02% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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. 14.4% 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.
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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 294 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. 294 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. 14.4% 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 route97.2%
- Frontier Airlines 1994 on the same route84.0%
- United Airlines 2108 on the same route70.2%
- Frontier Airlines 2350 on the same route86.3%
- Frontier Airlines 3540 on the same route67.2%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.