Best Time to Fly ATL to PDX: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → Portland International
Data through July 2026 · Last updated October 18, 2026
1,552 flights were scheduled from Atlanta (ATL) to Portland (PDX) in the last 12 months, and 79.0% of those that flew arrived on time, 1.4 points above the US average of 77.6%.
Alaska Airlines was the most punctual of the 2 airlines on the route at 82.4%, while Delta Air Lines trailed at 78.2%.
September has been the best month (88% on time) and Sunday the weakest day of the week (75%).
0.9% of flights were cancelled, versus 1.8% nationally.
ATL 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 |
|---|---|---|---|---|
| Alaska Airlines | 82.4% | 71 min | 0.7% | 286 |
| Delta Air Lines | 78.2% | 49 min | 0.9% | 1,264 |
| American Airlines | Limited data | 1 | ||
| Southwest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to PDX
On-time arrival % by scheduled departure hour (local time), 3,049 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 82.4% | 1.0% | 586 |
| 9am–10am | 79.3% | 0.0% | 146 |
| 10am–11am | 92.8% | 1.3% | 154 |
| 11am–12pm | 86.7% | 0.0% | 195 |
| 1pm–2pm | Limited data | 1 | |
| 2pm–3pm | Limited data | 1 | |
| 3pm–4pm | 81.4% | 0.0% | 59 |
| 4pm–5pm | 75.7% | 0.4% | 550 |
| 5pm–6pm | 60.5% | 0.0% | 147 |
| 6pm–7pm | 79.6% | 0.9% | 326 |
| 7pm–8pm | 73.8% | 0.6% | 786 |
| 8pm–9pm | 81.8% | 0.0% | 33 |
| 9pm–10pm | 78.7% | 4.1% | 49 |
| 10pm–11pm | Limited data | 16 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL 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) | 52.5% | -27.2 pts | 0.0% | 61 |
| Christmas & New Year (Dec 20 - Jan 3) | 69.6% | -10.0 pts | 0.0% | 112 |
| Summer peak (Jun 15 - Aug 15) | 77.0% | -2.7 pts | 1.1% | 656 |
| All other days | 79.6% | — | 0.6% | 2,220 |
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).