Chicago (ORD) to Portland (PDX): On-Time Performance
Data through July 2026
When you fly ORD to PDX matters as much as anything else about the booking: the route swung from 91% on-time in September 2024 to just 56% in December 2025. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (82% vs 58%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 7.7
- last 12 months
- Duration
- 4h 32m
- scheduled
- Distance
- 1,739 mi
Best airline from ORD to PDX
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 78% | 16 min | 0.4% | 2,906 |
| Alaska Airlines | 76% | 14 min | 0.7% | 1,101 |
| American Airlines | 65% | 27 min | 1.2% | 1,351 |
| Spirit Airlines | 30% | 44 min | 8.2% | 61 |
Monthly on-time trend
Best time to fly from ORD to PDX
Aim for departures around 6 a.m. (93% on-time); avoid 9 p.m. departures (45%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 18 min |
| Tuesdaybest | 79% | 14 min |
| Wednesday | 73% | 18 min |
| Thursday | 75% | 18 min |
| Friday | 70% | 22 min |
| Saturday | 75% | 18 min |
| Sunday | 71% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft47%
- Airline operations31%
- National airspace system17%
- Weather5%
Frequently asked questions
- How often are flights from ORD to PDX delayed?
- 26% of ORD–PDX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from ORD to PDX?
- United Airlines has the best on-time record on this route at 78%, based on 2,906 flights. 4 airlines flew ORD–PDX frequently enough to compare in this period.
- What is the best time of day to fly from ORD to PDX?
- Departures around 6 a.m. have the best record (93% on-time), while departures around 9 p.m. have the worst (45%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to PDX?
- The scheduled ORD–PDX flight time averages 4h 32m over 1,739 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are ORD to PDX flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ORD to PDX?
- December 2025 was the roughest month in this dataset, with only 56% of arrivals on time. The best was September 2024 at 91%. If your dates are flexible, that 35-point gap is worth planning around.
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Based on 5,419 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.