Carrier route record
DLLAS→ATL
Delta Air Lines · Las Vegas to Atlanta
- Flights
- 3,327
- Period
- July 2025 to June 2026
- Share of route
- 69%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on LAS to ATL earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 3,327 flights. The strongest carrier on the route with a full sample, Southwest Airlines, flew 720 at 82.9% on time.
Set against the rest of the country, Delta's LAS to ATL record is 10 points better than the US average of 77.6%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.
Key figures
On time
87.7%
Arrivals under 15 minutes late, of 3,291 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
0.72%
National rate is 1.81%
Whole route
85.2%
Every carrier on LAS to ATL, 4,791 flights
These figures cover 3,327 flights between July 2025 and June 2026. The median arrival is 9 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.
Carrier by carrier
Delta against every carrier on LAS to ATL
Delta flew 3,327 of the 4,791 flights on LAS to ATL, most of the route. Its 87.7% on time is 3 points better than the route as a whole, which runs 85.2%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from Delta at 87.7% to Frontier at 74.5%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Southwest Airlines arrives on time 82.9% of the time; Frontier Airlines manages 74.5%. Sample sizes sit next to every figure, because a two-point gap across 561 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 3,327 | 87.7% | 83 min | 0.72% | A+ |
| Southwest Airlines | 720 | 82.9% | 39 min | 0.69% | B+ |
| Spirit Airlinesthin sample | 183 | 82.3% | 69 min | 0.55% | B+ |
| Frontier Airlines | 561 | 74.5% | 70 min | 2.14% | C |
Southwest leads Frontier by 8 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Delta flight numbers on LAS to ATL
Departure window
When Delta 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 8 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am730 flights94.2%
- 8am–11am548 flights90.8%
- 11am–2pm748 flights84.9%
- 2pm–5pm477 flights83.5%
- 5pm–8pm2 flights—
- 8pm–5am822 flights84.7%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 94.2% of the time, against 83.5% for the afternoon window. That is 11 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 822 flights scheduled in it.
Across the year
Delta on LAS to ATL through the year
April is the best month on the calendar at 92.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. October was the busiest month here, with 295 flights.
Across the week, Wednesday is the strongest day at 93.8% on time and Sunday the weakest at 85.7%. 8 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 57% of the 34,000 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.
- 57%Carrier
- 30%Late-arriving aircraft
- 12%National Airspace System
- 0%Security
- 0%Extreme weather
The largest share of delay minutes, 57%, 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 19,000 of the 34,000 delay minutes reported here. The split is drawn from 33,836 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 94.2% on time here.
Cancellations are rare at 0.72%, below the national 1.81% 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 costs
Badly late arrivals are rare here: only 4.6% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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 77.3% on time across 3,329 flights, 10 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 10 points of difference.
The sample behind these figures is 3,327 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.
What to do with this
Booking Delta on LAS to ATL
Put together: take the 5am–8am departure, avoid March if the dates are flexible, and if two carriers are within a few dollars of each other, Southwest is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 11 points, which is the most any booking decision can do. 3,291 completed flights over 12 months sit behind that.
Related
Where to go next
- LAS to ATL, every carrier
- Delta on ATL to LAS, the return leg
- Southwest Airlines on LAS to ATL82.9%
- Spirit Airlines on LAS to ATL82.3%
- Frontier Airlines on LAS to ATL74.5%
- Delta Air Lines network-wide record
- Harry Reid International (LAS) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.