Route reliability record
ATL→LAS
Atlanta to Las Vegas
- Flights
- 4,758
- Period
- September 2025 to August 2026
- Distance
- 1,747 mi
- Carriers
- 4
This route sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 4,758 ATL to LAS flights, of which Delta Air Lines flew 3,324 at 76.5% on time.
Best time to fly ATL to LAS: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 90.9% of the time and Wednesday flights 82.8%, against 74.8% for the route overall.
Delta Air Lines is the most reliable of the three carriers covered here at 76.5% on time across 3,324 flights.
Key figures
On time
74.8%
Arrivals under 15 minutes late, of 4,713 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.78%
National rate is 1.89%
Best carrier
Delta
76.5% on time across 3,324 flights
These figures cover 4,758 flights between September 2025 and August 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on ATL to LAS
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 76.5% of the time; Frontier Airlines manages 62.9%. Sample sizes sit next to every figure, because a two-point gap across 596 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 3,324 | 76.5% | 57 min | 0.66% | B+ |
| Southwest Airlines | 719 | 76.4% | 49 min | 0.42% | B+ |
| Spirit Airlinesthin sample | 119 | 76.3% | 74 min | 0.84% | B+ |
| Frontier Airlines | 596 | 62.9% | 93 min | 1.85% | D |
The spread between Delta and Frontier 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
Flights on ATL to LAS
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 Las Vegas
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. ATL → LASAtlanta to Las Vegas | Southwest Airlines | 76.1% | 76.4% | 0.42% | 5am–8am, Wed | — |
| 2. ATL → LASAtlanta to Las Vegas | Delta Air Lines | 76.0% | 76.5% | 0.66% | 8am–11am, Wed | DL 777 08:15 |
| 3. ATL → LASAtlanta to Las Vegas | Frontier Airlines | 61.7% | 62.9% | 1.85% | 8am–11am, Sun | F9 4891 11:07 |
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 27 points, against 14 points between the best and worst carrier.
- 5am–8am566 flights90.9%
- 8am–11am804 flights83.9%
- 11am–2pm734 flights75.9%
- 2pm–5pm523 flights75.5%
- 5pm–8pm1,163 flights68.4%
- 8pm–5am968 flights64.2%
Scale runs 55% to 95%.
The 8pm–5am window is where this operation falls apart: 64.2% on time, against 90.9% for the 5am–8am 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 5pm–8pm window is the busiest, with 1,163 flights scheduled in it.
Explore
Filter ATL to LAS 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 LAS, the best departure window is 5am–8am at 90.9% on time and the worst is 8pm–5am at 64.2%, a wide gap of 26.7 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.9%
- 8–11am83.9%
- 11am–2pm75.9%
- 2–5pm75.5%
- 5–8pm68.4%
- 8pm–5am64.2%
best all US flightsScale 55% to 95%.
Across the year
When delays peak on this route
This route's year swings by 16 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.
August is the worst month at 64.9% on time, 16 points below November, the best at 80.6%. 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. December was the busiest month here, with 427 flights.
Across the week, Wednesday is the strongest day at 82.8% on time and Monday the weakest at 71.1%, a spread of 12 points.
Delay causes
Why this route gets delayed
Carrier accounts for 45% of the 74,000 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Carrier
- 31%Late-arriving aircraft
- 20%National Airspace System
- 3%Extreme weather
- 0%Security
The largest share of delay minutes, 45%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 34,000 of the 74,000 delay minutes reported here. The split is drawn from 74,449 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.9% on time here.
Cancellations are rare at 0.78%, 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
8.3% 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 1,747 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 83.8% on time across 4,755 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.
The sample behind these figures is 4,758 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 LAS 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. November runs 80.6% on time and August 64.9%, a swing of 16 points. If the dates move at all, move them out of August before you think about anything else. 4,713 completed flights over 12 months sit behind that.
Common questions
ATL to LAS questions
How often is ATL to LAS delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.2% of the 4,758 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 LAS?
Delta Air Lines leads at 76.5% on time across 3,324 flights. Frontier Airlines is at the other end on 62.9%, a gap of 14 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 LAS?
The 5am–8am departure window is the strongest at 90.9% on time. The 8pm–5am window is the weakest at 64.2%, 27 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 August delays on ATL to LAS?
August is the weakest month at 64.9% on time, compared with 80.6% in November. Across the year that is 16 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
- LAS to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Harry Reid International (LAS) delay statistics
- Delta Air Lines on ATL to LAS76.5%
- Southwest Airlines on ATL to LAS76.4%
- Spirit Airlines on ATL to LAS76.3%
- Frontier Airlines on ATL to LAS62.9%
- ATL to LGA, a related route72.3%
- LAX to LAS, a related route75.8%
- ATL to MCO, a related route70.3%
- Delta Air Lines on-time record76.5%
- Southwest Airlines on-time record76.4%
- Spirit Airlines on-time record76.3%
- Same route, different airline: where the carrier you pick matters most
- The best time of day to fly, according to 7.05 million flight records
Direction matters. ATL to LAS and LAS 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.