Portland (PDX) to Houston (IAH): On-Time Performance
Data through July 2026
The calendar drives reliability on PDX–IAH. September 2024 flights landed on schedule 95% of the time, but July 2026 dropped to 75% — a gap of 20 points. Across the full period the route averages 86% on-time against a national 78%.
- On-time
- 86%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 3.4
- last 12 months
- Duration
- 4h 13m
- scheduled
- Distance
- 1,825 mi
Best airline from PDX to IAH
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 87% | 13 min | 1.1% | 1,859 |
| Alaska Airlines | 82% | 10 min | 0.7% | 431 |
Monthly on-time trend
Best time to fly from PDX to IAH
Aim for departures around 7 a.m. (93% on-time); avoid 10 a.m. departures (77%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 85% | 10 min |
| Tuesdaybest | 89% | 13 min |
| Wednesday | 86% | 14 min |
| Thursday | 84% | 15 min |
| Friday | 82% | 16 min |
| Saturday | 88% | 11 min |
| Sunday | 86% | 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 aircraft37%
- Airline operations38%
- National airspace system24%
- Weather1%
Frequently asked questions
- How often are flights from PDX to IAH delayed?
- 14% of PDX–IAH 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 12 minutes.
- Which airline is most reliable from PDX to IAH?
- United Airlines has the best on-time record on this route at 87%, based on 1,859 flights. 2 airlines flew PDX–IAH frequently enough to compare in this period.
- What is the best time of day to fly from PDX to IAH?
- Departures around 7 a.m. have the best record (93% on-time), while departures around 10 a.m. have the worst (77%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PDX to IAH?
- The scheduled PDX–IAH flight time averages 4h 13m over 1,825 miles. Actual arrival times vary — flights on this route land 15+ minutes late 14% of the time.
- How often are PDX to IAH 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 PDX to IAH?
- July 2026 was the roughest month in this dataset, with only 75% of arrivals on time. The best was September 2024 at 95%. If your dates are flexible, that 20-point gap is worth planning around.
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Based on 2,290 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.