Route Reliability
Portland → Chicago
PWM–ORD · 900 miles · Portland International Jetport to Chicago O'Hare International Airport
- 77%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 2.8%
- Cancelled
- 1,461
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.American Airlines79%619 flights
- 2.United Airlines75%842 flights
What the data says
Morning flights do better here.
PWM–ORD flights departing between 6–9 AM arrived on time 89% of the time, versus 62% between 3–6 PM.
Friday comes out ahead.
A small edge: 81% on time on Fridays against 75% on Wednesdays.
American Airlines has a slight edge here.
American Airlines arrived on time 79% of the time on this route; United Airlines managed 75%.
Ticking up lately.
PWM–ORD flights arrived on time 81% of the time over the last three months in the data, compared with 75% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon75%(196 flights)
- Tue77%(194 flights)
- Wed75%(192 flights)
- Thu76%(206 flights)
- Fri81%(210 flights)
- Sat79%(207 flights)
- Sun77%(210 flights)
- 3–6 AM82%(39 flights)
- 6–9 AM89%(423 flights)
- 9 AM–12 PM87%(134 flights)
- 12–3 PM88%(142 flights)
- 3–6 PM62%(492 flights)
- 6–9 PM73%(185 flights)
Jun 75% → May 89% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 75% | 124 |
| July 2025 | 69% | 144 |
| August 2025 | 79% | 171 |
| September 2025 | 78% | 161 |
| October 2025 | 74% | 166 |
| November 2025 | 68% | 83 |
| December 2025 | 79% | 61 |
| January 2026 | 59% | 34 |
| February 2026 | 86% | 57 |
| March 2026 | 70% | 110 |
| April 2026 | 85% | 139 |
| May 2026 | 89% | 165 |
Same trip, other airports
Keep nerding
Based on 1,461 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.