Carrier route record
F9ATL→LAX
Frontier Airlines · Atlanta to Los Angeles
- Flights
- 521
- Period
- July 2025 to June 2026
- Share of route
- 10%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on ATL 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, 8 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 521 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 3,849 at 79.6% on time.
The national on-time rate over the same period is 77.6%, so Frontier on ATL to LAX runs 8 points behind the country as a whole. Across a thousand flights that is about 80 extra late arrivals.
Key figures
On time
69.6%
Arrivals under 15 minutes late, of 510 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
2.11%
National rate is 1.81%
Whole route
78.4%
Every carrier on ATL to LAX, 5,021 flights
These figures cover 521 flights between July 2025 and June 2026. Beyond the headline rate, 10.8% 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 ATL to LAX
Frontier flew 521 of the 5,021 flights on ATL to LAX, about 10% of it. Its 69.6% on time is 9 points worse than the route as a whole, which runs 78.4%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from Spirit at 83.7% to Frontier at 69.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 5 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 271 | 83.7% | 92 min | 0.37% | B+ |
| Delta Air Lines | 3,849 | 79.6% | 55 min | 0.75% | B+ |
| American Airlines | 380 | 74.3% | 111 min | 0.53% | C+ |
| Frontier Airlines (this page) | 521 | 69.6% | 63 min | 2.11% | C |
No carrier stands out. Delta tops the table at 79.6%, 5 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Frontier flight numbers on ATL to LAX
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 27 points, against 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am15 flights—
- 8am–11am278 flights73.5%
- 11am–2pm51 flights64.0%
- 2pm–5pm57 flights68.4%
- 5pm–8pm88 flights69.8%
- 8pm–5am32 flights46.7%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 46.7% on time, against 73.5% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 278 flights scheduled in it.
Across the year
Frontier on ATL to LAX through the year
July is the worst month at 51.1% on time, 34 points below September, the best at 85.1%. 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 60 flights.
Across the week, Wednesday is the strongest day at 78.5% on time and Sunday the weakest at 63.2%. 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. Carrier accounts for 44% of the 9,699 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.
- 44%Carrier
- 44%Late-arriving aircraft
- 11%National Airspace System
- 0%Extreme weather
44% 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 9,699 reported delay minutes here, that single category outweighs weather by 44 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 9,699 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,303 of the 9,699 delay minutes reported here.
Cancellations sit at 2.11% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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. 10.8% 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.
At 1,947 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg is a different operation and performs like one: it runs 60.1% on time across 520 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. 521 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 ATL to LAX
Put together: treat all of this as provisional. 521 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 69.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 510 completed flights over 12 months sit behind that.
Related
Where to go next
- ATL to LAX, every carrier
- Frontier on LAX to ATL, the return leg
- Spirit Airlines on ATL to LAX83.7%
- Delta Air Lines on ATL to LAX79.6%
- American Airlines on ATL to LAX74.3%
- Frontier Airlines network-wide record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Los Angeles International (LAX) delay statistics
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
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.