Chicago (ORD) to Portland (PWM): On-Time Performance
Data through May 2026
Chicago (ORD) to Portland (PWM) effectively runs on two schedules. In September 2024, 94% of arrivals were on time; in January 2025 that fell to 57% — a 38-point seasonal swing. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 68%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 4.0
- last 12 months
- Duration
- 2h 31m
- scheduled
- Distance
- 900 mi
Best airline from ORD to PWM
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Airmost reliable | 81% | 12 min | 1.6% | 501 |
| United Airlines | 79% | 15 min | 0.9% | 798 |
| Republic Airways | 77% | 16 min | 1.6% | 789 |
| SkyWest Airlines | 75% | 16 min | 2.0% | 502 |
Monthly on-time trend
Best time to fly from ORD to PWM
Aim for departures around 7 a.m. (98% on-time); avoid 7 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 16 min |
| Tuesday | 80% | 16 min |
| Wednesday | 80% | 13 min |
| Thursdaybest | 80% | 13 min |
| Friday | 78% | 16 min |
| Saturday | 77% | 13 min |
| Sunday | 75% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations33%
- National airspace system19%
- Weather6%
Frequently asked questions
- How often are flights from ORD to PWM delayed?
- 22% of ORD–PWM flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from ORD to PWM?
- Envoy Air has the best on-time record on this route at 81%, based on 501 flights. 4 airlines flew ORD–PWM frequently enough to compare in this period.
- What is the best time of day to fly from ORD to PWM?
- Departures around 7 a.m. have the best record (98% on-time), while departures around 7 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to PWM?
- The scheduled ORD–PWM flight time averages 2h 31m over 900 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are ORD to PWM flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from ORD to PWM?
- January 2025 was the roughest month in this dataset, with only 57% of arrivals on time. The best was September 2024 at 94%. If your dates are flexible, that 38-point gap is worth planning around.
Explore related pages
More routes from ORD
Based on 2,618 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.