Best Time to Fly PDX to ORD: On-Time Stats by Hour & Airline
Portland International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
2,808 flights were scheduled from Portland (PDX) to Chicago (ORD) in the last 12 months, and 79.0% of those that flew arrived on time, 1.3 points above the US average of 77.6%.
United Airlines was the most punctual of the 3 airlines on the route at 82.2%, while American Airlines trailed at 74.9%.
February has been the best month (88% on time) and Friday the weakest day of the week (78%).
1.0% of flights were cancelled, versus 1.8% nationally.
PDX 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 | 82.2% | 66 min | 0.8% | 1,402 |
| Alaska Airlines | 77.2% | 40 min | 1.4% | 510 |
| American Airlines | 74.9% | 101 min | 1.1% | 896 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PDX to ORD
On-time arrival % by scheduled departure hour (local time), 5,125 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | 56.1% | 1.5% | 67 |
| 6am–7am | 88.2% | 1.2% | 173 |
| 7am–8am | 83.3% | 0.7% | 1,449 |
| 8am–9am | 88.6% | 0.0% | 88 |
| 9am–10am | Limited data | 1 | |
| 10am–11am | 79.0% | 0.3% | 645 |
| 11am–12pm | 80.9% | 0.2% | 477 |
| 12pm–1pm | 54.0% | 0.0% | 38 |
| 1pm–2pm | 64.6% | 1.6% | 242 |
| 2pm–3pm | 70.5% | 0.2% | 443 |
| 3pm–4pm | 62.3% | 0.0% | 77 |
| 4pm–5pm | Limited data | 11 | |
| 5pm–6pm | 73.5% | 0.0% | 102 |
| 10pm–11pm | 83.7% | 0.4% | 278 |
| 11pm–12am | 83.6% | 1.7% | 1,034 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PDX 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) | 77.6% | -5.0 pts | 8.2% | 73 |
| Christmas & New Year (Dec 20 - Jan 3) | 83.6% | +1.1 pts | 0.6% | 167 |
| Summer peak (Jun 15 - Aug 15) | 71.3% | -11.2 pts | 1.0% | 1,247 |
| All other days | 82.6% | — | 0.6% | 3,638 |
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).