Carrier route record
F9LAS→DEN
Frontier Airlines · Las Vegas to Denver
- Flights
- 1,554
- Period
- July 2025 to June 2026
- Share of route
- 22%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on LAS to DEN lands a B+, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 1,554 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,416 at 83.7% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Frontier on LAS to DEN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 1,538 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
0.97%
National rate is 1.81%
Whole route
77.0%
Every carrier on LAS to DEN, 7,088 flights
These figures cover 1,554 flights between July 2025 and June 2026. Beyond the headline rate, 9.5% 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.
Carrier by carrier
Frontier against every carrier on LAS to DEN
Frontier flew 1,554 of the 7,088 flights on LAS to DEN, about 22% of it. Its 79.1% on time is 2 points better than the route as a whole, which runs 77.0%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from United at 83.7% to Southwest at 70.7%.
The choice of carrier is not cosmetic here. United Airlines arrives on time 83.7% of the time; Southwest Airlines manages 70.7%. Sample sizes sit next to every figure, because a two-point gap across 3,118 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 2,416 | 83.7% | 68 min | 0.50% | B+ |
| Frontier Airlines (this page) | 1,554 | 79.1% | 90 min | 0.97% | B+ |
| Southwest Airlines | 3,118 | 70.7% | 57 min | 1.12% | C |
The spread between United and Southwest is 13 points, wide enough that it should decide the booking. On a hundred trips that is 13 more arrivals inside the on-time window.
Flight by flight
Frontier flight numbers on LAS to DEN
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am268 flights86.9%
- 8am–11am259 flights87.8%
- 11am–2pm83 flights80.5%
- 2pm–5pm204 flights64.0%
- 5pm–8pm163 flights73.6%
- 8pm–5am577 flights78.1%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 87.8% of the time, against 64.0% for the afternoon window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 577 flights scheduled in it.
Across the year
Frontier on LAS to DEN through the year
July is the worst month at 68.3% on time, 19 points below February, the best at 87.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. June was the busiest month here, with 168 flights.
Across the week, Wednesday is the strongest day at 86.4% on time and Monday the weakest at 71.1%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Frontier runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 59% of the 29,000 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.
- 59%Late-arriving aircraft
- 23%Carrier
- 18%National Airspace System
- 0%Extreme weather
59% 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 29,000 reported delay minutes here, that single category outweighs weather by 59 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 29,064 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.8% on time here.
Cancellations sit at 0.97% against a national 1.81%, which is ordinary. Diversions add another 0.06%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.5% 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.
The return leg runs 76.3% on time across 1,557 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,554 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking Frontier on LAS to DEN
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 87.2% on time and July 68.3%, a swing of 19 points. If the dates move at all, move them out of July before you think about anything else. 1,538 completed flights over 12 months sit behind that.
Related
Where to go next
- LAS to DEN, every carrier
- Frontier on DEN to LAS, the return leg
- United Airlines on LAS to DEN83.7%
- Southwest Airlines on LAS to DEN70.7%
- Frontier Airlines network-wide record
- Harry Reid International (LAS) delay statistics
- Denver International (DEN) delay statistics
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
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.