Carrier route record
F9LAX→ATL
Frontier Airlines · Los Angeles to Atlanta
- Flights
- 520
- 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 LAX to ATL draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 520 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 3,844 at 81.5% on time.
The national on-time rate over the same period is 77.6%, so Frontier on LAX to ATL runs 17 points behind the country as a whole. Across a thousand flights that is about 175 extra late arrivals.
Key figures
On time
60.1%
Arrivals under 15 minutes late, of 511 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.73%
National rate is 1.81%
Whole route
78.4%
Every carrier on LAX to ATL, 5,013 flights
These figures cover 520 flights between July 2025 and June 2026. Beyond the headline rate, 13.3% 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 LAX to ATL
Frontier flew 520 of the 5,013 flights on LAX to ATL, about 10% of it. Its 60.1% on time is 18 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 84.7% to Frontier at 60.1%. One 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 81.5% of the time; American Airlines manages 66.8%. Sample sizes sit next to every figure, because a two-point gap across 379 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 270 | 84.7% | 67 min | 0.74% | B+ |
| Delta Air Lines | 3,844 | 81.5% | 64 min | 0.86% | B+ |
| American Airlines | 379 | 66.8% | 85 min | 0.53% | C+ |
| Frontier Airlines (this page) | 520 | 60.1% | 69 min | 1.73% | D |
The spread between Delta and American is 15 points, wide enough that it should decide the booking. On a hundred trips that is 15 more arrivals inside the on-time window.
Flight by flight
Frontier flight numbers on LAX to ATL
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 18 points, against 15 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am17 flights—
- 11am–2pm152 flights57.4%
- 2pm–5pm70 flights75.7%
- 5pm–8pm—
- 8pm–5am281 flights57.6%
Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 57.4% on time against 75.7% for 2pm–5pm. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 281 flights scheduled in it.
Across the year
Frontier on LAX to ATL through the year
July is the worst month at 23.4% on time, 60 points below October, the best at 82.9%. 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, Tuesday is the strongest day at 67.2% on time and Saturday the weakest at 54.5%. 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. Carrier accounts for 44% of the 14,000 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.
- 44%Carrier
- 39%Late-arriving aircraft
- 16%National Airspace System
- 0%Extreme weather
39% 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 14,000 reported delay minutes here, that single category outweighs weather by 39 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 14,144 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 6,259 of the 14,000 delay minutes reported here.
Cancellations sit at 1.73% 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. 13.3% 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 69.6% on time across 521 flights, 9 points above 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. 520 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 LAX to ATL
Put together: treat all of this as provisional. 520 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 60.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 511 completed flights over 12 months sit behind that.
Related
Where to go next
- LAX to ATL, every carrier
- Frontier on ATL to LAX, the return leg
- Spirit Airlines on LAX to ATL84.7%
- Delta Air Lines on LAX to ATL81.5%
- American Airlines on LAX to ATL66.8%
- Frontier Airlines network-wide record
- Los Angeles International (LAX) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Same route, different airline: where the carrier you pick matters most
- Why the first flight of the morning is statistically safest
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.