Best Time to Fly ATL to LAS: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.8% of Atlanta (ATL) to Las Vegas (LAS) flights arrived on time (4,773 scheduled flights). That is 1.8 points below the national average of 77.6%.
Among 4 airlines, Spirit Airlines led with 80.0% on time and Frontier Airlines was last with 63.9%.
Over 24 months, Wednesday was the most reliable day (82% on time) and June the worst month (68%).
The cancellation rate was 0.8% (US average 1.8%).
ATL to LAS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Spirit Airlines | 80.0% | 70 min | 0.6% | 156 |
| Delta Air Lines | 77.6% | 56 min | 0.6% | 3,322 |
| Southwest Airlines | 76.4% | 47 min | 0.4% | 719 |
| Frontier Airlines | 63.9% | 90 min | 2.4% | 576 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to LAS
On-time arrival % by scheduled departure hour (local time), 9,822 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 26 | |
| 6am–7am | 91.8% | 0.2% | 464 |
| 7am–8am | 86.2% | 1.0% | 802 |
| 8am–9am | 85.4% | 0.2% | 808 |
| 9am–10am | 82.5% | 1.0% | 590 |
| 10am–11am | 78.1% | 1.3% | 469 |
| 11am–12pm | 77.9% | 0.9% | 539 |
| 12pm–1pm | 81.7% | 0.2% | 543 |
| 1pm–2pm | 77.0% | 0.0% | 230 |
| 2pm–3pm | 80.3% | 0.9% | 329 |
| 3pm–4pm | 71.6% | 0.2% | 410 |
| 4pm–5pm | 77.3% | 0.4% | 545 |
| 5pm–6pm | 69.8% | 0.4% | 552 |
| 6pm–7pm | 72.5% | 0.3% | 677 |
| 7pm–8pm | 65.1% | 1.2% | 1,209 |
| 8pm–9pm | 64.6% | 1.3% | 529 |
| 9pm–10pm | 70.9% | 1.5% | 750 |
| 10pm–11pm | 64.8% | 3.3% | 329 |
| 11pm–12am | Limited data | 21 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL to LAS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 74.1% | -3.6 pts | 0.5% | 190 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.2% | -3.4 pts | 1.0% | 406 |
| Summer peak (Jun 15 - Aug 15) | 69.4% | -8.2 pts | 1.6% | 1,668 |
| All other days | 77.6% | — | 0.7% | 7,558 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).