Best Time to Fly LAS to ORD: On-Time Stats by Hour & Airline
Harry Reid International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
5,237 flights were scheduled from Las Vegas (LAS) to Chicago (ORD) in the last 12 months, and 76.7% of those that flew arrived on time, 0.9 points below the US average of 77.6%.
Spirit Airlines was the most punctual of the 5 airlines on the route at 84.6%, while Frontier Airlines trailed at 67.2%.
February has been the best month (85% on time) and Friday the weakest day of the week (75%).
1.3% of flights were cancelled, versus 1.8% nationally.
LAS to ORD 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 | 84.6% | 56 min | 2.0% | 199 |
| United Airlines | 79.9% | 76 min | 0.5% | 2,337 |
| American Airlines | 75.8% | 107 min | 2.3% | 1,889 |
| Southwest Airlines | 67.7% | 59 min | 0.3% | 608 |
| Frontier Airlines | 67.2% | 94 min | 3.9% | 204 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAS to ORD
On-time arrival % by scheduled departure hour (local time), 10,554 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 79.9% | 1.9% | 413 |
| 1am–2am | 86.1% | 0.0% | 36 |
| 5am–6am | 92.7% | 0.9% | 111 |
| 6am–7am | 92.7% | 0.5% | 399 |
| 7am–8am | 89.9% | 0.5% | 1,209 |
| 8am–9am | 83.0% | 0.9% | 428 |
| 9am–10am | 83.8% | 0.6% | 858 |
| 10am–11am | 85.5% | 0.5% | 789 |
| 11am–12pm | 79.9% | 0.2% | 591 |
| 12pm–1pm | 64.4% | 0.7% | 704 |
| 1pm–2pm | 65.1% | 0.6% | 315 |
| 2pm–3pm | 68.7% | 0.4% | 832 |
| 3pm–4pm | 66.0% | 2.9% | 597 |
| 4pm–5pm | 76.1% | 1.4% | 434 |
| 5pm–6pm | 73.9% | 0.9% | 772 |
| 6pm–7pm | 73.9% | 0.3% | 286 |
| 7pm–8pm | 81.7% | 0.0% | 72 |
| 8pm–9pm | Limited data | 10 | |
| 9pm–10pm | Limited data | 2 | |
| 10pm–11pm | Limited data | 6 | |
| 11pm–12am | 84.4% | 1.5% | 1,690 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAS to ORD
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) | 75.4% | -5.5 pts | 2.8% | 182 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.6% | -0.3 pts | 0.6% | 343 |
| Summer peak (Jun 15 - Aug 15) | 72.4% | -8.5 pts | 1.5% | 1,825 |
| All other days | 80.9% | — | 0.8% | 8,204 |
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).