Best Time to Fly PDX to IAH: On-Time Stats by Hour & Airline
Portland International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.2% of Portland (PDX) to Houston (IAH) flights arrived on time (1,227 scheduled flights). That is 7.6 points above the national average of 77.6%.
Among 2 airlines, United Airlines led with 85.9% on time and Alaska Airlines was last with 83.7%.
Over 24 months, Tuesday was the most reliable day (89% on time) and July the worst month (76%).
The cancellation rate was 0.5% (US average 1.8%).
PDX to IAH on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 85.9% | 75 min | 0.3% | 874 |
| Alaska Airlines | 83.7% | 42 min | 0.8% | 353 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PDX to IAH
On-time arrival % by scheduled departure hour (local time), 2,197 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 11 | |
| 6am–7am | Limited data | 11 | |
| 7am–8am | 93.8% | 1.0% | 807 |
| 10am–11am | 77.3% | 1.1% | 287 |
| 11am–12pm | 90.9% | 1.5% | 67 |
| 12pm–1pm | 76.9% | 0.0% | 238 |
| 1pm–2pm | 81.8% | 0.3% | 332 |
| 2pm–3pm | 84.9% | 0.0% | 120 |
| 10pm–11pm | Limited data | 1 | |
| 11pm–12am | 86.2% | 1.2% | 323 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PDX to IAH
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 97.2% | +8.7 pts | 0.0% | 36 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.5% | -6.1 pts | 1.0% | 98 |
| Summer peak (Jun 15 - Aug 15) | 78.3% | -10.3 pts | 1.5% | 470 |
| All other days | 88.5% | — | 0.6% | 1,593 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).