Best Time to Fly PWM to ORD: On-Time Stats by Hour & Airline
Portland International Jetport → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.3% of Portland (PWM) to Chicago (ORD) flights arrived on time (1,494 scheduled flights). That is 0.7 points above the national average of 77.6%.
Among 4 airlines, Republic Airways led with 84.3% on time and SkyWest Airlines was last with 65.0%.
Over 24 months, Monday was the most reliable day (80% on time) and January the worst month (71%).
The cancellation rate was 3.5% (US average 1.8%).
PWM 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 |
|---|---|---|---|---|
| Republic Airways | 84.3% | 85 min | 4.0% | 573 |
| Envoy Air | 81.9% | 97 min | 4.1% | 196 |
| United Airlines | 77.8% | 82 min | 2.1% | 429 |
| SkyWest Airlines | 65.0% | 89 min | 4.0% | 296 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PWM to ORD
On-time arrival % by scheduled departure hour (local time), 2,666 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 82.0% | 11.4% | 44 |
| 6am–7am | 91.7% | 1.9% | 680 |
| 7am–8am | 83.1% | 0.0% | 125 |
| 9am–10am | 88.6% | 1.4% | 142 |
| 11am–12pm | 84.5% | 0.8% | 124 |
| 12pm–1pm | 86.2% | 0.6% | 343 |
| 1pm–2pm | Limited data | 6 | |
| 2pm–3pm | Limited data | 21 | |
| 3pm–4pm | 55.7% | 1.4% | 72 |
| 4pm–5pm | 66.8% | 1.7% | 639 |
| 5pm–6pm | 59.6% | 4.7% | 213 |
| 6pm–7pm | 70.1% | 3.3% | 180 |
| 7pm–8pm | 80.0% | 9.7% | 72 |
| 10pm–11pm | Limited data | 5 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PWM 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) | Limited data | 34 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 91.1% | +10.6 pts | 0.0% | 56 |
| Summer peak (Jun 15 - Aug 15) | 72.7% | -7.7 pts | 1.5% | 609 |
| All other days | 80.4% | — | 2.2% | 1,967 |
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).