Route reliability record
ATL→LAX
Atlanta to Los Angeles
- Flights
- 4,851
- Period
- September 2025 to August 2026
- Distance
- 1,947 mi
- Carriers
- 4
This route lands a B+, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 4,851 ATL to LAX flights, of which Delta Air Lines flew 3,817 at 79.1% on time.
Best time to fly ATL to LAX: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 87.3% of the time and Wednesday flights 83.8%, against 77.8% for the route overall.
Delta Air Lines is the most reliable of the three carriers covered here at 79.1% on time across 3,817 flights.
Key figures
On time
77.8%
Arrivals under 15 minutes late, of 4,806 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
Best carrier
Delta
79.1% on time across 3,817 flights
These figures cover 4,851 flights between September 2025 and August 2026. The median arrival is 5 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.
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Carrier by carrier
Which airline is most reliable on ATL to LAX
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 79.1% of the time; Frontier Airlines manages 70.5%. Sample sizes sit next to every figure, because a two-point gap across 490 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 3,817 | 79.1% | 57 min | 0.73% | B+ |
| Spirit Airlinesthin sample | 167 | 78.9% | 92 min | 0.60% | B+ |
| American Airlines | 377 | 73.0% | 120 min | 0.80% | C+ |
| Frontier Airlines | 490 | 70.5% | 61 min | 1.63% | C |
Delta leads Frontier by 9 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on ATL to LAX
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Atlanta to Los Angeles
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. ATL → LAXAtlanta to Los Angeles | Delta Air Lines | 78.5% | 79.1% | 0.73% | 5am–8am, Wed | DL 898 08:05 |
| 2. ATL → SNAAtlanta to Santa Ana | Delta Air Lines | 75.3% | 76.0% | 0.88% | 2pm–5pm, Sat | DL 826 20:51 |
| 3. ATL → ONTAtlanta to Ontario | Delta Air Lines | 72.9% | 74.2% | 1.71% | 8am–11am, Wed | DL 665 09:41 |
| 4. ATL → LAXAtlanta to Los Angeles | American Airlines | 72.4% | 73.0% | 0.80% | 2pm–5pm, Wed | — |
| 5. ATL → LAXAtlanta to Los Angeles | Frontier Airlines | 69.4% | 70.5% | 1.63% | 8am–11am, Wed | F9 4315 10:35 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against 9 points between the best and worst carrier.
- 5am–8am474 flights87.3%
- 8am–11am1,199 flights84.4%
- 11am–2pm571 flights84.7%
- 2pm–5pm976 flights74.6%
- 5pm–8pm949 flights68.4%
- 8pm–5am682 flights71.3%
Scale runs 60% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.3% of the time, against 68.4% for the evening window. That is 19 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 1,199 flights scheduled in it.
Explore
Filter ATL to LAX by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On ATL to LAX, the best departure window is 5am–8am at 87.3% on time and the worst is 5pm–8pm at 68.4%, a wide gap of 18.9 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am87.3%
- 8–11am84.4%
- 11am–2pm84.7%
- 2–5pm74.6%
- 5–8pm68.4%
- 8pm–5am71.3%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 18 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 67.7% on time, 18 points below March, the best at 85.8%. 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. September was the busiest month here, with 455 flights.
Across the week, Wednesday is the strongest day at 83.8% on time and Sunday the weakest at 72.8%, a spread of 11 points.
Delay causes
Why this route gets delayed
Carrier accounts for 52% of the 69,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 27%Late-arriving aircraft
- 16%National Airspace System
- 5%Extreme weather
- 0%Security
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 36,000 of the 69,000 delay minutes reported here. The split is drawn from 68,817 reported delay minutes.
Cancellations are rare at 0.82%, 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 actually costs
6.8% 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 78.6% on time across 4,843 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.
The sample behind these figures is 4,851 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in LAX after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 85.8% on time and July 67.7%, a swing of 18 points. If the dates move at all, move them out of July before you think about anything else. 4,806 completed flights over 12 months sit behind that.
Common questions
ATL to LAX questions
How often is ATL to LAX delayed?
Roughly one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.2% of the 4,851 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on ATL to LAX?
Delta Air Lines leads at 79.1% on time across 3,817 flights. Frontier Airlines is at the other end on 70.5%, a gap of 9 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on ATL to LAX?
The 5am–8am departure window is the strongest at 87.3% on time. The 5pm–8pm window is the weakest at 68.4%, 19 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on ATL to LAX?
July is the weakest month at 67.7% on time, compared with 85.8% in March. Across the year that is 18 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- LAX to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Los Angeles International (LAX) delay statistics
- Delta Air Lines on ATL to LAX79.1%
- Spirit Airlines on ATL to LAX78.9%
- American Airlines on ATL to LAX73.0%
- Frontier Airlines on ATL to LAX70.5%
- ATL to LGA, a related route72.3%
- SFO to LAX, a related route70.9%
- ATL to MCO, a related route70.3%
- Delta Air Lines on-time record79.1%
- Spirit Airlines on-time record78.9%
- American Airlines on-time record73.0%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. ATL to LAX and LAX to ATL are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.