Best Time to Fly IAH to PDX: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Portland International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 80.8% of Houston (IAH) to Portland (PDX) flights arrived on time (1,227 scheduled flights). That is 3.1 points above the national average of 77.6%.
United Airlines was the most punctual of the 2 airlines on the route at 82.3%, while Alaska Airlines trailed at 77.0%.
September has been the best month (87% on time) and Thursday the weakest day of the week (78%).
0.5% of flights were cancelled, versus 1.8% nationally.
IAH to PDX 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 | 82.3% | 63 min | 0.2% | 874 |
| Alaska Airlines | 77.0% | 60 min | 1.1% | 353 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to PDX
On-time arrival % by scheduled departure hour (local time), 2,196 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 1 | |
| 9am–10am | 86.8% | 0.5% | 604 |
| 10am–11am | 81.6% | 0.0% | 125 |
| 2pm–3pm | 91.2% | 2.9% | 35 |
| 4pm–5pm | 81.7% | 0.7% | 310 |
| 5pm–6pm | 77.0% | 0.9% | 335 |
| 6pm–7pm | 77.3% | 0.0% | 75 |
| 7pm–8pm | 66.7% | 0.0% | 118 |
| 8pm–9pm | 78.4% | 0.8% | 593 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAH to PDX
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) | 72.2% | -9.4 pts | 0.0% | 36 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.6% | -1.0 pts | 1.0% | 99 |
| Summer peak (Jun 15 - Aug 15) | 78.2% | -3.4 pts | 1.3% | 470 |
| All other days | 81.6% | — | 0.4% | 1,591 |
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).