Best Time to Fly ORD to PDX: On-Time Stats by Hour & Airline
Chicago O'Hare International → Portland International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 69.0% of Chicago (ORD) to Portland (PDX) flights arrived on time (2,805 scheduled flights). That is 8.6 points below the national average of 77.6%.
Among 3 airlines, United Airlines led with 72.9% on time and American Airlines was last with 61.3%.
Over 24 months, Tuesday was the most reliable day (80% on time) and December the worst month (67%).
The cancellation rate was 0.8% (US average 1.8%).
ORD to PDX 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 | 72.9% | 63 min | 0.6% | 1,404 |
| Alaska Airlines | 72.0% | 57 min | 1.2% | 506 |
| American Airlines | 61.3% | 74 min | 1.0% | 895 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to PDX
On-time arrival % by scheduled departure hour (local time), 5,122 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.3% | 0.0% | 30 |
| 7am–8am | 83.7% | 0.7% | 618 |
| 8am–9am | 79.4% | 0.0% | 195 |
| 9am–10am | 84.8% | 0.1% | 737 |
| 10am–11am | 77.0% | 0.8% | 123 |
| 11am–12pm | 66.2% | 0.0% | 71 |
| 12pm–1pm | 77.0% | 0.0% | 528 |
| 1pm–2pm | 74.6% | 0.5% | 194 |
| 2pm–3pm | 72.9% | 0.9% | 565 |
| 3pm–4pm | 90.2% | 0.0% | 51 |
| 4pm–5pm | 76.1% | 0.3% | 762 |
| 5pm–6pm | 63.2% | 2.6% | 39 |
| 6pm–7pm | 45.5% | 2.9% | 34 |
| 7pm–8pm | 60.6% | 0.5% | 433 |
| 8pm–9pm | 63.7% | 1.8% | 508 |
| 9pm–10pm | 45.3% | 3.0% | 199 |
| 10pm–11pm | 57.1% | 0.0% | 35 |
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 PDX
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) | 60.3% | -16.8 pts | 6.8% | 73 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.5% | -8.6 pts | 0.6% | 166 |
| Summer peak (Jun 15 - Aug 15) | 66.8% | -10.4 pts | 0.8% | 1,247 |
| All other days | 77.1% | — | 0.5% | 3,636 |
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).