Carrier route record

F9IAH→LAX

Frontier Airlines · Houston to Los Angeles

Flights: 336
Period: September 2025 to August 2026
Share of route: 7%
Carriers: 6

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.

Frontier on IAH to LAX sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 336 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 648 at 87.7% on time.

Delta Air Lines is the most reliable of the three carriers covered here at 87.7% on time across 648 flights.

On time

71.8%

Arrivals under 15 minutes late, of 333 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.89%

National rate is 1.89%

Whole route

84.1%

Every carrier on IAH to LAX, 5,147 flights

These figures cover 336 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Frontier against every carrier on IAH to LAX

Frontier flew 336 of the 5,147 flights on IAH to LAX, about 7% of it. Its 71.8% on time is 12 points worse than the route as a whole, which runs 84.1%. Ranked by on-time rate it is last of six carriers on the route, where the range runs from American at 100.0% to Frontier at 71.8%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.7% of the time; SkyWest Airlines manages 79.3%. Sample sizes sit next to every figure, because a two-point gap across 408 flights means less than a ten-point one.

On-time performance by carrier on IAH to LAX
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlinesthin sample	1	100.0%	—	0.00%	A+
Delta Air Lines	648	87.7%	70 min	0.93%	A+
United Airlines	3,421	85.7%	57 min	0.20%	A+
SkyWest Airlines	408	79.3%	77 min	0.49%	B+
Spirit Airlinesthin sample	333	78.9%	71 min	1.50%	B
Frontier Airlines (this page)thin sample	336	71.8%	60 min	0.89%	C+

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

Flight by flight

Frontier flight numbers on IAH to LAX

F9 175516:0271.9% · 334 flights

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Departure window

When Frontier runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 336 flights.

5am–8am26 flights—
8am–11am48 flights68.8%
11am–2pm69 flights68.1%
2pm–5pm93 flights71.4%
5pm–8pm77 flights72.4%
8pm–5am23 flights—

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is the strongest at 72.4% on time. The full set of windows spans 4 points.

Across the year

Frontier on IAH to LAX through the year

Jul–Sep 202521 flights—
Oct–Dec 202583 flights61.4%
Jan–Mar 202679 flights73.1%
Apr–Jun 202691 flights76.9%
Jul–Sep 202662 flights73.3%

Scale runs 55% to 80%. 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 71.8% on time across 336 flights.

Frontier on IAH to LAX did not run the same all year. Its best quarter was Apr–Jun 2026 at 76.9% on time and its weakest Oct–Dec 2025 at 61.4%, a swing of 16 points on roughly 84 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, Thursday is the strongest day at 86.5% on time and Saturday the weakest at 62.7%, a spread of 24 points.

Arrival by arrival

How late Frontier on IAH to LAX runs when it is late

Frontier on IAH to LAX often beats the schedule: 118 of 333 completed flights, 35%, arrived 15 minutes or more early. The 94 late arrivals split 41 under half an hour, 26 between 30 and 60 minutes, and 27 an hour or more.

15+ min early118 flights35.4%
Within 15 min121 flights36.3%
15–29 min late41 flights12.3%
30–59 min late26 flights7.8%
1–2 hours late16 flights4.8%
2+ hours late11 flights3.3%

Scale runs 0% to 100%.

Share of 333 completed flights by arrival against schedule.

22 of 97 late departures made up the time and arrived on time, 23% of them. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAX.

The worst days

Worst days for Frontier on IAH to LAX

The latest arrival of the period was on 24 January 2026, 7 hours 12 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of Frontier on IAH to LAX in the period
Date	Arrived late by	Largest filed cause
24 January 2026	7 hours 12 minutes	Extreme weather
11 May 2026	5 hours	Carrier
21 April 2026	4 hours 47 minutes	Late-arriving aircraft
13 July 2026	3 hours 43 minutes	Carrier
12 August 2026	3 hours 25 minutes	Carrier

Delay causes

Why Frontier runs late on this route

Late-arriving aircraft accounts for 49% of the 5,663 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
49%
Carrier
31%
National Airspace System
13%
Extreme weather
7%

49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,663 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 5,663 reported delay minutes.

Cancellations are rare at 0.89%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

8.1% of arrivals land an hour or more late, close to the national 8.3%, so 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 1,379 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.

The return leg runs 70.6% on time across 336 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 336 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 IAH to LAX

Put together: treat all of this as provisional. 336 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 71.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 333 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures