Carrier route record

F9LAX→ATL

Frontier Airlines · Los Angeles to Atlanta

Flights: 489
Period: September 2025 to August 2026
Share of route: 10%
Carriers: 4

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

Frontier on LAX to ATL sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 489 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 3,811 at 80.8% on time.

The national on-time rate over the same period is 77.3%, so Frontier on LAX to ATL runs 9 points behind the country as a whole. Across a thousand flights that is about 91 extra late arrivals.

On time

68.2%

Arrivals under 15 minutes late, of 481 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

1.64%

National rate is 1.89%

Whole route

78.6%

Every carrier on LAX to ATL, 4,843 flights

These figures cover 489 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% 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 LAX to ATL

Frontier flew 489 of the 4,843 flights on LAX to ATL, about 10% of it. Its 68.2% on time is 10 points worse than the route as a whole, which runs 78.6%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from Spirit at 85.5% to American at 66.5%. 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 80.8% of the time; American Airlines manages 66.5%. Sample sizes sit next to every figure, because a two-point gap across 376 flights means less than a ten-point one.

On-time performance by carrier on LAX to ATL
Airline	Flights	On time	Avg delay	Cancelled	Grade
Spirit Airlinesthin sample	167	85.5%	68 min	0.60%	A+
Delta Air Lines	3,811	80.8%	66 min	0.84%	B+
Frontier Airlines (this page)	489	68.2%	65 min	1.64%	C
American Airlines	376	66.5%	84 min	0.53%	C+

The spread between Delta and American is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.

Flight by flight

Frontier flight numbers on LAX to ATL

F9 321623:3469.1% · 261 flights

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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 11 points, against 14 points between the best and worst carrier.

5am–8am—
8am–11am17 flights—
11am–2pm116 flights65.5%
2pm–5pm71 flights76.1%
5pm–8pm—
8pm–5am285 flights67.9%

Scale runs 55% 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 65.5% on time against 76.1% 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 285 flights scheduled in it.

Across the year

Frontier on LAX to ATL through the year

Darker means more delays. Figures are on-time percentages.August best, March worst

Delays peak in March, when the on-time rate falls to 46.7%. August is the strongest month at 90.3%. Moving a flexible trip across that boundary buys 44 points. June was the busiest month here, with 60 flights.

Across the week, Thursday is the strongest day at 77.8% on time and Saturday the weakest at 59.7%, a spread of 18 points.

Arrival by arrival

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

Frontier on LAX to ATL often beats the schedule: 122 of 481 completed flights, 25%, arrived 15 minutes or more early. The 153 late arrivals split 58 under half an hour, 53 between 30 and 60 minutes, and 42 an hour or more.

15+ min early122 flights25.4%
Within 15 min206 flights42.8%
15–29 min late58 flights12.1%
30–59 min late53 flights11.0%
1–2 hours late26 flights5.4%
2+ hours late16 flights3.3%

Scale runs 0% to 100%.

Share of 481 completed flights by arrival against schedule.

A late pushback is often recovered here: of 179 departures that left 15 minutes late or more, 59 still arrived on time. In the other direction, 33 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 ATL.

The worst days

Worst days for Frontier on LAX to ATL

The latest arrival of the period was on 22 April 2026, 16 hours 40 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of Frontier on LAX to ATL in the period
Date	Arrived late by	Largest filed cause
22 April 2026	16 hours 40 minutes	Carrier
4 August 2026	9 hours 17 minutes	Carrier
21 January 2026	4 hours 50 minutes	Late-arriving aircraft
26 January 2026	4 hours 45 minutes	Carrier
24 November 2025	4 hours 23 minutes	National Airspace System

Delay causes

Why Frontier runs late on this route

Carrier accounts for 51% of the 9,902 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
51%
Late-arriving aircraft
32%
National Airspace System
17%
Extreme weather
0%

The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,056 of the 9,902 delay minutes reported here. The split is drawn from 9,902 reported delay minutes.

Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

8.7% 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.

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 runs 70.5% on time across 490 flights, within 2 points 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. 489 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. 489 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 68.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 481 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