Route reliability record
LAS→ATL
Las Vegas to Atlanta
- Flights
- 4,755
- Period
- September 2025 to August 2026
- Distance
- 1,747 mi
- Carriers
- 4
This route lands a B+, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 4,755 LAS to ATL flights, of which Delta Air Lines flew 3,323 at 85.7% on time.
Best time to fly LAS to ATL: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 90.5% of the time and Wednesday flights 90.0%, against 83.8% for the route overall.
Delta Air Lines is the most reliable of the three carriers covered here at 85.7% on time across 3,323 flights.
Key figures
On time
83.8%
Arrivals under 15 minutes late, of 4,693 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.84%
National rate is 1.89%
Best carrier
Delta
85.7% on time across 3,323 flights
These figures cover 4,755 flights between September 2025 and August 2026. The median arrival is 7 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 LAS to ATL
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 85.7% of the time; Frontier Airlines manages 74.8%. 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 |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 116 | 86.1% | 77 min | 0.86% | A+ |
| Delta Air Lines | 3,323 | 85.7% | 85 min | 0.84% | A+ |
| Southwest Airlines | 720 | 81.9% | 39 min | 0.42% | B+ |
| Frontier Airlines | 596 | 74.8% | 75 min | 1.34% | C |
Delta leads Frontier by 11 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on LAS to ATL
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 Las Vegas to Atlanta
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. LAS → ATLLas Vegas to Atlanta | Delta Air Lines | 85.0% | 85.7% | 0.84% | 5am–8am, Wed | DL 755 06:00 |
| 2. LAS → ATLLas Vegas to Atlanta | Southwest Airlines | 81.6% | 81.9% | 0.42% | 8pm–5am, Tue | — |
| 3. LAS → ATLLas Vegas to Atlanta | Frontier Airlines | 73.8% | 74.8% | 1.34% | 5am–8am, Wed | F9 1116 06:45 |
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 13 points, against 11 points between the best and worst carrier.
- 5am–8am977 flights90.5%
- 8am–11am812 flights85.0%
- 11am–2pm868 flights80.5%
- 2pm–5pm495 flights80.5%
- 5pm–8pm41 flights78.0%
- 8pm–5am1,562 flights81.9%
Scale runs 70% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.5% of the time, against 78.0% for the evening window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 1,562 flights scheduled in it.
Explore
Filter LAS to ATL 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 LAS to ATL, the best departure window is 5am–8am at 90.5% on time and the worst is 5pm–8pm at 78.0%, a wide gap of 12.5 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.5%
- 8–11am85.0%
- 11am–2pm80.5%
- 2–5pm80.5%
- 5–8pm78.0%
- 8pm–5am81.9%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 21 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 68.4% on time, 21 points below February, the best at 89.4%. 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 429 flights.
Across the week, Wednesday is the strongest day at 90.0% on time and Friday the weakest at 78.5%, a spread of 12 points.
Delay causes
Why this route gets delayed
Carrier accounts for 52% of the 57,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 33%Late-arriving aircraft
- 14%National Airspace System
- 1%Extreme weather
- 0%Security
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 30,000 of the 57,000 delay minutes reported here. The split is drawn from 57,467 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 90.5% on time here.
Cancellations are rare at 0.84%, 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
5.3% 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 a little over 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 74.8% on time across 4,758 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.
The sample behind these figures is 4,755 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 ATL 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. February runs 89.4% on time and July 68.4%, a swing of 21 points. If the dates move at all, move them out of July before you think about anything else. 4,693 completed flights over 12 months sit behind that.
Common questions
LAS to ATL questions
How often is LAS to ATL delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 16.2% of the 4,755 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on LAS to ATL?
Delta Air Lines leads at 85.7% on time across 3,323 flights. Frontier Airlines is at the other end on 74.8%, a gap of 11 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 LAS to ATL?
The 5am–8am departure window is the strongest at 90.5% on time. The 5pm–8pm window is the weakest at 78.0%, 13 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 LAS to ATL?
July is the weakest month at 68.4% on time, compared with 89.4% in February. Across the year that is 21 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
- ATL to LAS — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Spirit Airlines on LAS to ATL86.1%
- Delta Air Lines on LAS to ATL85.7%
- Southwest Airlines on LAS to ATL81.9%
- Frontier Airlines on LAS to ATL74.8%
- LAS to LAX, a related route77.9%
- LGA to ATL, a related route75.5%
- LAS to DEN, a related route76.5%
- Spirit Airlines on-time record86.1%
- Delta Air Lines on-time record85.7%
- Southwest Airlines on-time record81.9%
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
Direction matters. LAS to ATL and ATL to LAS 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.