Houston (IAH) to Portland (PDX): On-Time Performance
Data through May 2026
When you fly IAH to PDX matters as much as anything else about the booking: the route swung from 89% on-time in April 2026 to just 66% in June 2025. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 76%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 3.4
- last 12 months
- Duration
- 4h 36m
- scheduled
- Distance
- 1,825 mi
Best airline from IAH to PDX
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 80% | 15 min | 1.0% | 1,777 |
| Alaska Airlines | 80% | 15 min | 1.1% | 370 |
Monthly on-time trend
Best time to fly from IAH to PDX
Aim for departures around 2 p.m. (91% on-time); avoid 7 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 14 min |
| Tuesdaybest | 82% | 11 min |
| Wednesday | 80% | 18 min |
| Thursday | 78% | 20 min |
| Friday | 81% | 11 min |
| Saturday | 79% | 17 min |
| Sunday | 80% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations33%
- National airspace system12%
- Weather11%
Frequently asked questions
- How often are flights from IAH to PDX delayed?
- 20% of IAH–PDX 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 IAH to PDX?
- United Airlines has the best on-time record on this route at 80%, based on 1,777 flights. 2 airlines flew IAH–PDX frequently enough to compare in this period.
- What is the best time of day to fly from IAH to PDX?
- Departures around 2 p.m. have the best record (91% on-time), while departures around 7 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to PDX?
- The scheduled IAH–PDX flight time averages 4h 36m over 1,825 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are IAH to PDX flights cancelled?
- 1% 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 IAH to PDX?
- June 2025 was the roughest month in this dataset, with only 66% of arrivals on time. The best was April 2026 at 89%. If your dates are flexible, that 23-point gap is worth planning around.
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Based on 2,147 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.