Best Time to Fly PDX to MIA: On-Time Stats by Hour & Airline
Portland International → Miami International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.0% of Portland (PDX) to Miami (MIA) flights arrived on time (342 scheduled flights). That is 6.4 points above the national average of 77.6%.
Among 2 airlines, American Airlines led with 84.3% on time and Alaska Airlines was last with 83.6%.
Over 24 months, Monday was the most reliable day (90% on time) and May the worst month (71%).
The cancellation rate was 0.9% (US average 1.8%).
PDX to MIA 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 |
|---|---|---|---|---|
| American Airlines | 84.3% | 58 min | 1.0% | 200 |
| Alaska Airlines | 83.6% | 74 min | 0.7% | 142 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PDX to MIA
On-time arrival % by scheduled departure hour (local time), 694 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 83.5% | 0.7% | 141 |
| 9am–10am | 76.8% | 0.0% | 82 |
| 10am–11am | 82.3% | 1.4% | 69 |
| 9pm–10pm | Limited data | 6 | |
| 10pm–11pm | 86.0% | 0.3% | 359 |
| 11pm–12am | 80.6% | 2.7% | 37 |
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 MIA
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) | Limited data | 25 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 77.0% | -7.7 pts | 0.0% | 61 |
| Summer peak (Jun 15 - Aug 15) | Limited data | 5 | ||
| All other days | 84.8% | — | 0.7% | 603 |
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).