Ontario (ONT) to Portland (PDX): On-Time Performance
Data through July 2026
Ontario (ONT) to Portland (PDX) effectively runs on two schedules. In April 2025, 100% of arrivals were on time; in October 2024 that fell to 73% — a 28-point seasonal swing. Across the full period the route averages 88% on-time against a national 78%. Morning departures also hold up better than evening ones (93% vs 82%), which matters most in the rough months.
- On-time
- 88%
- arrived <15 min late
- Avg delay
- 7 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 1.5
- last 12 months
- Duration
- 2h 23m
- scheduled
- Distance
- 838 mi
Best airline from ONT to PDX
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlinesmost reliable | 92% | 6 min | 1.0% | 693 |
| SkyWest Airlines | 91% | 5 min | 0.7% | 275 |
| Frontier Airlines | 75% | 12 min | 1.1% | 264 |
Monthly on-time trend
Best time to fly from ONT to PDX
Aim for departures around 6 a.m. (97% on-time); avoid 2 p.m. departures (76%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 88% | 6 min |
| Tuesday | 89% | 5 min |
| Wednesday | 90% | 5 min |
| Thursday | 85% | 9 min |
| Friday | 87% | 8 min |
| Saturdaybest | 91% | 8 min |
| Sunday | 88% | 8 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft54%
- Airline operations27%
- National airspace system16%
- Weather2%
Frequently asked questions
- How often are flights from ONT to PDX delayed?
- 12% of ONT–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 7 minutes.
- Which airline is most reliable from ONT to PDX?
- Alaska Airlines has the best on-time record on this route at 92%, based on 693 flights. 3 airlines flew ONT–PDX frequently enough to compare in this period.
- What is the best time of day to fly from ONT to PDX?
- Departures around 6 a.m. have the best record (97% on-time), while departures around 2 p.m. have the worst (76%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ONT to PDX?
- The scheduled ONT–PDX flight time averages 2h 23m over 838 miles. Actual arrival times vary — flights on this route land 15+ minutes late 12% of the time.
- How often are ONT to PDX flights cancelled?
- 1% 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 ONT to PDX?
- October 2024 was the roughest month in this dataset, with only 73% of arrivals on time. The best was April 2025 at 100%. If your dates are flexible, that 28-point gap is worth planning around.
Explore related pages
More routes from ONT
Other ways to fly to Portland (PDX)
Related guides
Based on 1,249 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.