Carrier route record

F9DEN→LAS

Frontier Airlines · Denver to Las Vegas

Flights: 1,557
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 DEN to LAS lands a B+, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 1,557 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,420 at 78.6% on time.

The US average over the same twelve months is 77.6%, so there is little to separate Frontier on DEN to LAS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

76.3%

Arrivals under 15 minutes late, of 1,542 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

0.96%

National rate is 1.81%

Whole route

75.3%

Every carrier on DEN to LAS, 7,108 flights

These figures cover 1,557 flights between July 2025 and June 2026. Beyond the headline rate, 8.6% 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 DEN to LAS

Frontier flew 1,557 of the 7,108 flights on DEN to LAS, about 22% of it. Its 76.3% on time is about level with the route as a whole at 75.3%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from United at 78.6% to Southwest at 72.3%.

The choice of carrier is not cosmetic here. United Airlines arrives on time 78.6% of the time; Southwest Airlines manages 72.3%. Sample sizes sit next to every figure, because a two-point gap across 3,131 flights means less than a ten-point one.

On-time performance by carrier on DEN to LAS
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	2,420	78.6%	66 min	0.37%	B+
Frontier Airlines (this page)	1,557	76.3%	71 min	0.96%	B+
Southwest Airlines	3,131	72.3%	57 min	0.73%	C+

United leads Southwest by 6 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Flight by flight

Frontier flight numbers on DEN to LAS

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 6 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am235 flights90.5%
8am–11am277 flights80.1%
11am–2pm200 flights76.4%
2pm–5pm203 flights73.9%
5pm–8pm284 flights66.5%
8pm–5am358 flights73.3%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 90.5% of the time, against 66.5% for the evening 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 358 flights scheduled in it.

Across the year

Frontier on DEN to LAS through the year

Darker means more delays. Figures are on-time percentages.February best, July worst

July is the worst month at 69.2% on time, 16 points below February, the best at 85.6%. 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 83.0% on time and Monday the weakest at 70.2%. 13 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 45% of the 26,000 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.

Late-arriving aircraft
45%
Carrier
26%
National Airspace System
26%
Extreme weather
3%

45% 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 26,000 reported delay minutes here, that single category outweighs weather by 16 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 25,960 reported delay minutes.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.5% on time here.

Cancellations sit at 0.96% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

8.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

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 79.1% on time across 1,554 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 1,557 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 DEN to LAS

Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 85.6% on time and July 69.2%, a swing of 16 points. If the dates move at all, move them out of July before you think about anything else. 1,542 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures