IAD to PWM flight delays
Washington, VA (IAD) Portland, ME (PWM) · 493 miles
107 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
88.68%
Arrived on time
Within 15 minutes of schedule
0.93%
Cancelled
Share of scheduled flights
70 min
When late, late by
Average across delayed arrivals
9 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 70 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
Flights from Washington to Portland are among the most dependable in the record. A route this punctual is usually a short hop between airports with slots to spare.
Every airline on IAD to PWM
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Republic Airways | 77 | 92.11% | 1.3% | 89 min | — |
| United Airlines | 30 | 80% | 0% | 51 min | — |
The return leg
PWM to IAD Portland back to Washington 85.84% on time BOther routes from Washington
Common questions
Are flights from Washington to Portland usually delayed?
88.68% of flights on the IAD to PWM route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
How often are IAD to PWM flights cancelled?
0.93% of scheduled flights did not operate — about 9 in every thousand. That is in the normal range.
When IAD to PWM flights are late, how late are they?
About 70 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on IAD to PWM during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →