Baltimore (BWI) to Portland (PWM): On-Time Performance
Data through May 2026
The calendar drives reliability on BWI–PWM. February 2025 flights landed on schedule 90% of the time, but July 2025 dropped to 53% — a gap of 36 points. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 66%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 3.7
- last 12 months
- Duration
- 1h 30m
- scheduled
- Distance
- 452 mi
Monthly on-time trend
Best time to fly from BWI to PWM
Aim for departures around 11 a.m. (93% on-time); avoid 5 p.m. departures (49%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 14 min |
| Tuesday | 81% | 11 min |
| Wednesdaybest | 82% | 10 min |
| Thursday | 77% | 11 min |
| Friday | 77% | 13 min |
| Saturday | 77% | 12 min |
| Sunday | 72% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations37%
- National airspace system14%
- Weather5%
Frequently asked questions
- How often are flights from BWI to PWM delayed?
- 23% of BWI–PWM flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from BWI to PWM?
- Departures around 11 a.m. have the best record (93% on-time), while departures around 5 p.m. have the worst (49%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BWI to PWM?
- The scheduled BWI–PWM flight time averages 1h 30m over 452 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are BWI to PWM flights cancelled?
- 1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from BWI to PWM?
- July 2025 was the roughest month in this dataset, with only 53% of arrivals on time. The best was February 2025 at 90%. If your dates are flexible, that 36-point gap is worth planning around.
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Based on 2,668 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.