Best Time to Fly ORD to PHX: On-Time Stats by Hour & Airline
Chicago O'Hare International → Phoenix Sky Harbor International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 73.1% of Chicago (ORD) to Phoenix (PHX) flights arrived on time (5,586 scheduled flights). That is 4.5 points below the national average of 77.6%.
Among 4 airlines, United Airlines led with 79.4% on time and Southwest Airlines was last with 60.0%.
Over 24 months, Tuesday was the most reliable day (82% on time) and July the worst month (65%).
The cancellation rate was 1.8% (US average 1.8%).
ORD to PHX 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 | 79.4% | 69 min | 0.7% | 1,968 |
| American Airlines | 71.0% | 87 min | 2.2% | 2,994 |
| Frontier Airlines | 68.8% | 84 min | 4.1% | 195 |
| Southwest Airlines | 60.0% | 69 min | 2.3% | 429 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to PHX
On-time arrival % by scheduled departure hour (local time), 11,223 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 89.6% | 1.8% | 441 |
| 6am–7am | 92.4% | 0.4% | 227 |
| 7am–8am | 85.6% | 1.0% | 1,198 |
| 8am–9am | 85.2% | 0.8% | 510 |
| 9am–10am | 84.8% | 0.5% | 878 |
| 10am–11am | 76.4% | 0.7% | 549 |
| 11am–12pm | 81.3% | 0.1% | 730 |
| 12pm–1pm | 83.8% | 0.5% | 437 |
| 1pm–2pm | 83.7% | 0.5% | 1,043 |
| 2pm–3pm | 60.1% | 1.1% | 628 |
| 3pm–4pm | 70.8% | 0.4% | 694 |
| 4pm–5pm | 74.9% | 1.1% | 793 |
| 5pm–6pm | 70.5% | 1.7% | 537 |
| 6pm–7pm | 76.2% | 1.3% | 455 |
| 7pm–8pm | 70.7% | 1.6% | 614 |
| 8pm–9pm | 66.4% | 2.5% | 964 |
| 9pm–10pm | 66.9% | 1.6% | 258 |
| 10pm–11pm | 57.6% | 5.3% | 264 |
| 11pm–12am | Limited data | 1 | |
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 PHX
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) | 69.5% | -9.9 pts | 4.5% | 199 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.6% | -1.8 pts | 0.2% | 510 |
| Summer peak (Jun 15 - Aug 15) | 66.4% | -12.9 pts | 1.8% | 1,740 |
| All other days | 79.4% | — | 1.0% | 8,774 |
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).