Best Time to Fly PWM to ATL: On-Time Stats by Hour & Airline
Portland International Jetport → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.5% of Portland (PWM) to Atlanta (ATL) flights arrived on time (642 scheduled flights). That is 3.8 points above the national average of 77.6%.
Delta Air Lines was the only reporting airline with regular flights on this route.
April has been the best month (94% on time) and Sunday the weakest day of the week (75%).
1.1% of flights were cancelled, versus 1.8% nationally.
PWM to ATL 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 |
|---|---|---|---|---|
| Delta Air Lines | 81.5% | 90 min | 1.1% | 642 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PWM to ATL
On-time arrival % by scheduled departure hour (local time), 1,233 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 86.8% | 0.7% | 291 |
| 6am–7am | 88.9% | 1.1% | 439 |
| 11am–12pm | Limited data | 1 | |
| 12pm–1pm | Limited data | 25 | |
| 1pm–2pm | 73.2% | 0.3% | 314 |
| 2pm–3pm | 58.5% | 0.0% | 42 |
| 5pm–6pm | Limited data | 4 | |
| 6pm–7pm | 57.1% | 3.6% | 110 |
| 7pm–8pm | Limited data | 7 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PWM to ATL
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 | 21 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 93.3% | +8.2 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 65.9% | -19.2 pts | 2.6% | 350 |
| All other days | 85.1% | — | 0.4% | 832 |
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).