Carrier route record

F9LAS→IAH

Frontier Airlines · Las Vegas to Houston

Flights: 328
Period: July 2025 to June 2026
Share of route: 9%
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 IAH lands a B, 3 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 about an hour on average. That is a workable record, not a spotless one. That rests on 328 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,601 at 85.6% on time.

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

On time

80.2%

Arrivals under 15 minutes late, of 324 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

1.22%

National rate is 1.81%

Whole route

83.9%

Every carrier on LAS to IAH, 3,455 flights

These figures cover 328 flights between July 2025 and June 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

Frontier against every carrier on LAS to IAH

Frontier flew 328 of the 3,455 flights on LAS to IAH, about 9% of it. Its 80.2% on time is 4 points worse than the route as a whole, which runs 83.9%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from United at 85.6% to Spirit at 77.6%.

The choice of carrier is not cosmetic here. United Airlines arrives on time 85.6% of the time; Spirit Airlines manages 77.6%. Sample sizes sit next to every figure, because a two-point gap across 526 flights means less than a ten-point one.

On-time performance by carrier on LAS to IAH
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	2,601	85.6%	73 min	0.58%	A+
Frontier Airlines (this page)thin sample	328	80.2%	60 min	1.22%	B
Spirit Airlines	526	77.6%	92 min	2.47%	B

United leads Spirit by 8 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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 17 points, against 8 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am84 flights87.8%
8am–11am102 flights82.2%
11am–2pm43 flights85.7%
2pm–5pm96 flights70.8%
5pm–8pm3 flights—
8pm–5am—

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 87.8% of the time, against 70.8% for the afternoon window. That is 17 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 102 flights scheduled in it.

Across the year

Frontier on LAS to IAH through the year

Jul–Sep 202559 flights80.7%
Oct–Dec 202561 flights86.9%
Jan–Mar 202660 flights83.3%
Apr–Jun 2026148 flights76.0%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 80.2% on time across 328 flights.

Frontier on LAS to IAH did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.9% on time and its weakest Apr–Jun 2026 at 76.0%, a swing of 11 points on roughly 82 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.

Across the week, Saturday is the strongest day at 82.9% on time and Monday the weakest at 73.3%. 10 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 3,851 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%
National Airspace System
28%
Carrier
28%

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 3,851 reported delay minutes here, that single category outweighs weather by 45 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 3,851 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 87.8% on time here.

Cancellations sit at 1.22% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

6.8% 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 about an hour, which a normal layover absorbs.

The 1,222 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 is a different operation and performs like one: it runs 71.7% on time across 328 flights, 9 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 9 points of difference.

One caution: this is a thin sample. 328 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 Frontier on LAS to IAH

Put together: treat all of this as provisional. 328 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 80.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 324 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