Atlanta (ATL) to Portland (PWM): On-Time Performance
Data through July 2026
Atlanta (ATL) to Portland (PWM) effectively runs on two schedules. In September 2025, 90% of arrivals were on time; in July 2026 that fell to 44% — a 46-point seasonal swing. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (83% vs 72%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 1.3%
- Flights/day
- 1.8
- last 12 months
- Duration
- 2h 35m
- scheduled
- Distance
- 1,027 mi
Monthly on-time trend
Best time to fly from ATL to PWM
Aim for departures around 10 a.m. (85% on-time); avoid 3 p.m. departures (56%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 14 min |
| Tuesday | 76% | 12 min |
| Wednesdaybest | 77% | 14 min |
| Thursday | 71% | 17 min |
| Friday | 77% | 18 min |
| Saturday | 76% | 16 min |
| Sunday | 64% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft28%
- Airline operations48%
- National airspace system19%
- Weather5%
Frequently asked questions
- How often are flights from ATL to PWM delayed?
- 26% of ATL–PWM flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 16 minutes.
- What is the best time of day to fly from ATL to PWM?
- Departures around 10 a.m. have the best record (85% on-time), while departures around 3 p.m. have the worst (56%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to PWM?
- The scheduled ATL–PWM flight time averages 2h 35m over 1,027 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are ATL to PWM flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to PWM?
- July 2026 was the roughest month in this dataset, with only 44% of arrivals on time. The best was September 2025 at 90%. If your dates are flexible, that 46-point gap is worth planning around.
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Based on 1,295 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.