Best Time to Fly LAX to ORD: On-Time Stats by Hour & Airline
Los Angeles International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.2% of Los Angeles (LAX) to Chicago (ORD) flights arrived on time (7,025 scheduled flights). That is 1.4 points below the national average of 77.6%.
Among 5 airlines, United Airlines led with 80.4% on time and Frontier Airlines was last with 60.5%.
Over 24 months, Tuesday was the most reliable day (84% on time) and August the worst month (76%).
The cancellation rate was 1.5% (US average 1.8%).
LAX 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 |
|---|---|---|---|---|
| United Airlines | 80.4% | 68 min | 0.7% | 3,388 |
| Spirit Airlines | 78.3% | 84 min | 4.2% | 189 |
| American Airlines | 72.8% | 95 min | 2.0% | 3,061 |
| Delta Air Lines | 72.4% | 74 min | 0.0% | 151 |
| Frontier Airlines | 60.5% | 143 min | 5.1% | 236 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAX to ORD
On-time arrival % by scheduled departure hour (local time), 13,959 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 82.0% | 2.1% | 773 |
| 1am–2am | 79.5% | 4.5% | 134 |
| 5am–6am | 94.6% | 1.0% | 305 |
| 6am–7am | 93.3% | 0.4% | 1,136 |
| 7am–8am | 89.3% | 0.3% | 1,075 |
| 8am–9am | 87.0% | 0.9% | 1,000 |
| 9am–10am | 80.8% | 0.5% | 620 |
| 10am–11am | 75.4% | 1.0% | 1,115 |
| 11am–12pm | 68.6% | 1.6% | 732 |
| 12pm–1pm | 69.8% | 2.0% | 991 |
| 1pm–2pm | 69.3% | 1.0% | 506 |
| 2pm–3pm | 70.2% | 0.7% | 831 |
| 3pm–4pm | 62.2% | 3.8% | 347 |
| 4pm–5pm | 81.2% | 1.6% | 446 |
| 5pm–6pm | 79.4% | 1.1% | 1,057 |
| 6pm–7pm | 79.7% | 1.1% | 440 |
| 7pm–8pm | Limited data | 22 | |
| 10pm–11pm | 86.3% | 0.7% | 693 |
| 11pm–12am | 80.4% | 1.5% | 1,736 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAX 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) | 70.8% | -10.5 pts | 3.8% | 267 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.9% | -0.4 pts | 1.3% | 598 |
| Summer peak (Jun 15 - Aug 15) | 76.0% | -5.3 pts | 2.1% | 2,788 |
| All other days | 81.3% | — | 0.9% | 10,306 |
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).