74% of flights from Atlanta to Las Vegas arrived on time over the past 12 months. That is worse than the typical U.S. route. The 6 a.m. departures ran on time 93% of the time; the 7 p.m. ones 60%. Most reliable airline: Southwest Airlines (76%). 9% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for ATL → LAS: when a flight was late, it was under 45 minutes late 56% of the time. About 1 in 12 flights landed an hour or more late, and 1 in 82 three hours or more; 0.8% were cancelled outright.
- On time or early74%
- 15–30 min late9.1%
- 30–60 min late7.7%
- 1–2 hours late5.2%
- 2–3 hours late1.7%
- 3+ hours late1.2%
- Diverted0.2%
- Cancelled0.8%
Share of all 4,758 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Delta Air Lines | 3,324 | 76% | 0.7% | −3 min | 7.3% | +57 min | Delta Air Lines |
| Southwest Airlines | 719 | 76% | 0.4% | −4 min | 5.7% | +49 min | Southwest Airlines |
| Frontier Airlines | 596 | 61% | 1.8% | +2 min | 16.1% | +93 min | Frontier Airlines |
| Spirit Airlines | 119 | 76% | 0.8% | −11 min | 8.4% | +74 min | Spirit Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at ATL). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Delta Air Lines | Southwest Airlines | Frontier Airlines |
|---|---|---|---|
| 6 a.m. | — | 94% | — |
| 7 a.m. | 84% | — | — |
| 8 a.m. | 86% | — | — |
| 9 a.m. | 84% | — | — |
| 10 a.m. | 83% | — | — |
| 11 a.m. | 78% | — | 63% |
| noon | 84% | — | — |
| 1 p.m. | 73% | — | — |
| 3 p.m. | 78% | — | — |
| 4 p.m. | 76% | — | — |
| 5 p.m. | 78% | — | — |
| 6 p.m. | 69% | — | — |
| 7 p.m. | 70% | — | 54% |
| 8 p.m. | 70% | — | 58% |
| 9 p.m. | 65% | — | — |
Last flight of the day
On ATL → LAS, each airline's last flight of the day was cancelled 1.1% of the time, against 0.7% for its earlier flights (1.7× as often). It arrived 3+ hours late 2.5% of the time (earlier flights: 0.9%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Delta Air Lines | 9:20 p.m. | 1.1% | 1.1% | 0.6% | first flight 7:25 a.m. |
| Frontier Airlines | 7:11 p.m. | 2.0% | 5.9% | 2.0% | first flight 11:07 a.m. |
| Southwest Airlines | 7:35 p.m. | 0.6% | 1.4% | 0.3% | first flight 6:30 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in LAS tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: December (82%). Worst: July (63%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 710 | 71% | 0.6% |
| Tuesday | 649 | 76% | 0.3% |
| Wednesday | 654 | 82% | 0.3% |
| Thursday | 698 | 72% | 0.0% |
| Friday | 703 | 72% | 0.7% |
| Saturday | 644 | 75% | 1.2% |
| Sunday | 700 | 71% | 2.3% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 21 · weather 15 · air traffic/airport 1
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 777 | 8:15 a.m. | 341 | 84% | 1.2% | −5 min | Delta Air Lines |
| DL 945 | 9:55 a.m. | 203 | 81% | 1.5% | −4 min | Delta Air Lines |
| DL 466 | 11:00 a.m. | 306 | 79% | 0.7% | −2 min | Delta Air Lines |
| F9 4891 | 11:07 a.m. | 273 | 66% | 1.8% | +2 min | Frontier Airlines |
| DL 549 | 12:15 p.m. | 347 | 77% | 0.3% | −3 min | Delta Air Lines |
| DL 659 | 3:50 p.m. | 333 | 77% | 0.6% | −3 min | Delta Air Lines |
| DL 711 | 4:40 p.m. | 360 | 77% | 0.3% | −3 min | Delta Air Lines |
| F9 3923 | 7:11 p.m. | 300 | 55% | 2.0% | +6 min | Frontier Airlines |
| DL 955 | 9:10 p.m. | 222 | 64% | 0.9% | +3 min | Delta Air Lines |
| DL 825 | 9:20 p.m. | 230 | 63% | 0.4% | +3 min | Delta Air Lines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Feb 17, 2026 | 12 | 8% | 0 |
| Mar 16, 2026 | 14 | 14% | 1 |
| Apr 28, 2026 | 13 | 15% | 0 |
| Feb 18, 2026 | 12 | 17% | 0 |
| Mar 7, 2026 | 11 | 18% | 1 |
Questions
How often are flights from ATL to LAS on time?
74% of 4,758 scheduled flights from Atlanta, GA to Las Vegas, NV arrived within 15 minutes of schedule between September 2025 and August 2026. 0.8% were cancelled.
What is the best time of day to fly ATL to LAS?
Flights scheduled to leave at 6 a.m. were the most reliable (93% on time). The 7 p.m. departures were the least (60%).
Which airline is most on time from ATL to LAS?
Southwest Airlines: 76% of its 719 flights on the route arrived on time. Delta Air Lines: 76%. Frontier Airlines: 61%. Spirit Airlines: 76%.
What month has the most delays from ATL to LAS?
July (63% on time). The best month is December (82%), over 2023–2026.
Is the last flight of the day from ATL to LAS more likely to be cancelled?
Yes. Each airline's last ATL–LAS flight of the day was cancelled 1.1% of the time over the past year, against 0.7% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- LAS → ATL (return)
- Atlanta Hartsfield-Jackson (ATL) delays by hour
- Flights into Las Vegas Harry Reid (LAS)
- Delta Air Lines on-time record
- Southwest Airlines on-time record
- Frontier Airlines on-time record
- Spirit Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.