Portland (PWM) to Baltimore (BWI): On-Time Performance
Data through May 2026
When you fly PWM to BWI matters as much as anything else about the booking: the route swung from 91% on-time in September 2025 to just 65% in July 2025. Across the full period the route averages 81% 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
- 81%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 3.7
- last 12 months
- Duration
- 1h 39m
- scheduled
- Distance
- 452 mi
Monthly on-time trend
Best time to fly from PWM to BWI
Aim for departures around 6 a.m. (92% on-time); avoid 5 p.m. departures (65%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 16 min |
| Tuesday | 81% | 12 min |
| Wednesdaybest | 86% | 10 min |
| Thursday | 82% | 9 min |
| Friday | 76% | 17 min |
| Saturday | 83% | 12 min |
| Sunday | 81% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations27%
- National airspace system21%
- Weather8%
- Security1%
Frequently asked questions
- How often are flights from PWM to BWI delayed?
- 19% of PWM–BWI 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 PWM to BWI?
- Departures around 6 a.m. have the best record (92% on-time), while departures around 5 p.m. have the worst (65%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PWM to BWI?
- The scheduled PWM–BWI flight time averages 1h 39m over 452 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are PWM to BWI flights cancelled?
- 0.8% 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 PWM to BWI?
- July 2025 was the roughest month in this dataset, with only 65% of arrivals on time. The best was September 2025 at 91%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 2,670 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.