Best Time to Fly ORD to PWM: On-Time Stats by Hour & Airline
Chicago O'Hare International → Portland International Jetport
Data through July 2026 · Last updated October 18, 2026
1,494 flights were scheduled from Chicago (ORD) to Portland (PWM) in the last 12 months, and 74.6% of those that flew arrived on time, 3.0 points below the US average of 77.6%.
Envoy Air was the most punctual of the 4 airlines on the route at 82.0%, while SkyWest Airlines trailed at 69.7%.
September has been the best month (87% on time) and Sunday the weakest day of the week (76%).
2.6% of flights were cancelled, versus 1.8% nationally.
ORD to PWM 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 |
|---|---|---|---|---|
| Envoy Air | 82.0% | 72 min | 3.6% | 196 |
| Republic Airways | 76.5% | 72 min | 3.1% | 572 |
| United Airlines | 72.2% | 66 min | 1.2% | 430 |
| SkyWest Airlines | 69.7% | 68 min | 3.0% | 296 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to PWM
On-time arrival % by scheduled departure hour (local time), 2,666 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 97.1% | 0.0% | 171 |
| 8am–9am | 88.7% | 0.3% | 294 |
| 9am–10am | Limited data | 15 | |
| 10am–11am | 81.7% | 0.4% | 280 |
| 11am–12pm | 79.7% | 0.8% | 519 |
| 12pm–1pm | Limited data | 7 | |
| 1pm–2pm | 78.2% | 2.1% | 290 |
| 2pm–3pm | Limited data | 19 | |
| 3pm–4pm | 85.5% | 4.2% | 72 |
| 4pm–5pm | Limited data | 2 | |
| 5pm–6pm | 63.8% | 3.2% | 154 |
| 6pm–7pm | 70.2% | 1.3% | 529 |
| 7pm–8pm | 64.8% | 3.5% | 171 |
| 8pm–9pm | 73.6% | 7.0% | 114 |
| 9pm–10pm | Limited data | 29 | |
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 PWM
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) | 60.0% | -20.8 pts | 11.8% | 34 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.5% | -6.3 pts | 0.0% | 56 |
| Summer peak (Jun 15 - Aug 15) | 69.9% | -10.9 pts | 1.0% | 609 |
| All other days | 80.8% | — | 1.7% | 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).