Portland (PWM) to Washington (IAD): On-Time Performance
Data through July 2026
Portland (PWM) to Washington (IAD) effectively runs on two schedules. In November 2025, 96% of arrivals were on time; in June 2025 that fell to 79% — a 17-point seasonal swing. Across the full period the route averages 86% on-time against a national 78%. Morning departures also hold up better than evening ones (94% vs 81%), which matters most in the rough months.
- On-time
- 86%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 2.6%
- Flights/day
- 1.9
- last 12 months
- Duration
- 1h 56m
- scheduled
- Distance
- 493 mi
Best airline from PWM to IAD
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 94% | 6 min | 0.0% | 152 |
| Republic Airways | 85% | 12 min | 2.9% | 1,427 |
Monthly on-time trend
Best time to fly from PWM to IAD
Aim for departures around 5 a.m. (95% on-time); avoid 2 p.m. departures (78%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 10 min |
| Tuesdaybest | 90% | 11 min |
| Wednesday | 83% | 9 min |
| Thursday | 85% | 14 min |
| Friday | 88% | 8 min |
| Saturday | 86% | 17 min |
| Sunday | 87% | 9 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations18%
- National airspace system32%
- Weather11%
Frequently asked questions
- How often are flights from PWM to IAD delayed?
- 14% of PWM–IAD 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 11 minutes.
- Which airline is most reliable from PWM to IAD?
- United Airlines has the best on-time record on this route at 94%, based on 152 flights. 2 airlines flew PWM–IAD frequently enough to compare in this period.
- What is the best time of day to fly from PWM to IAD?
- Departures around 5 a.m. have the best record (95% on-time), while departures around 2 p.m. have the worst (78%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PWM to IAD?
- The scheduled PWM–IAD flight time averages 1h 56m over 493 miles. Actual arrival times vary — flights on this route land 15+ minutes late 14% of the time.
- How often are PWM to IAD flights cancelled?
- 2.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from PWM to IAD?
- June 2025 was the roughest month in this dataset, with only 79% of arrivals on time. The best was November 2025 at 96%. If your dates are flexible, that 17-point gap is worth planning around.
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Based on 1,579 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.