Best Time to Fly ORD to LAS: On-Time Stats by Hour & Airline
Chicago O'Hare International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
5,241 flights were scheduled from Chicago (ORD) to Las Vegas (LAS) in the last 12 months, and 74.0% of those that flew arrived on time, 3.6 points below the US average of 77.6%.
Spirit Airlines was the most punctual of the 5 airlines on the route at 83.1%, while Frontier Airlines trailed at 59.5%.
September has been the best month (82% on time) and Friday the weakest day of the week (73%).
1.4% of flights were cancelled, versus 1.8% nationally.
ORD 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 | 83.1% | 74 min | 1.5% | 198 |
| United Airlines | 80.5% | 68 min | 0.5% | 2,335 |
| Southwest Airlines | 73.4% | 69 min | 0.8% | 609 |
| American Airlines | 66.6% | 71 min | 2.3% | 1,893 |
| Frontier Airlines | 59.5% | 156 min | 5.3% | 206 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to LAS
On-time arrival % by scheduled departure hour (local time), 10,553 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 93.4% | 0.0% | 61 |
| 6am–7am | 92.1% | 0.4% | 737 |
| 7am–8am | 90.2% | 0.6% | 1,215 |
| 8am–9am | 85.8% | 0.4% | 526 |
| 9am–10am | 84.0% | 0.6% | 731 |
| 10am–11am | 78.2% | 0.2% | 901 |
| 11am–12pm | 86.9% | 0.0% | 442 |
| 12pm–1pm | 80.5% | 0.5% | 448 |
| 1pm–2pm | 80.2% | 0.6% | 893 |
| 2pm–3pm | 71.8% | 1.1% | 275 |
| 3pm–4pm | 68.8% | 0.3% | 618 |
| 4pm–5pm | 72.6% | 1.1% | 665 |
| 5pm–6pm | 61.5% | 1.0% | 405 |
| 6pm–7pm | 66.7% | 0.8% | 368 |
| 7pm–8pm | 64.5% | 0.8% | 758 |
| 8pm–9pm | 61.1% | 2.1% | 845 |
| 9pm–10pm | 66.1% | 2.8% | 358 |
| 10pm–11pm | 59.0% | 5.4% | 276 |
| 11pm–12am | Limited data | 29 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD 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) | 68.8% | -9.8 pts | 2.8% | 182 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.1% | -4.5 pts | 0.3% | 344 |
| Summer peak (Jun 15 - Aug 15) | 69.9% | -8.7 pts | 1.3% | 1,818 |
| All other days | 78.6% | — | 0.8% | 8,209 |
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).