Route · IAD → PWM · 2020–2025 BTS data
Washington to Portland
The IAD–PWM corridor (Washington, DC → Portland, ME) runs ahead of the national average, served by 9 carriers across roughly 493 miles.
Data updated 2026-06-13
- 85.5%
- On-time
- +6.5 pts
- vs US avg
- 77 min
- Delay when late
- 2,863
- Flights
Cancelled
1.8%
Best Month
Oct 2024 93%
Worst Month
Jun 2025 76%
Distance
493 mi
Carriers
9
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 32 | 9 | 0 | 0 | YX |
| Nov 2025 | 55 | 5 | 1 | 0 | YX |
| Oct 2025 | 100 | 11 | 0 | 0 | YX |
| Sep 2025 | 94 | 7 | 1 | 0 | YX |
| Aug 2025 | 108 | 9 | 1 | 0 | YX |
| Jul 2025 | 123 | 28 | 11 | 0 | YX |
| Jun 2025 | 127 | 31 | 1 | 0 | YX |
| May 2025 | 130 | 20 | 1 | 0 | YX |
| Mar 2025 | 31 | 5 | 0 | 0 | YX |
| Dec 2024 | 46 | 8 | 0 | 0 | UA,YX |
| Nov 2024 | 47 | 2 | 0 | 0 | YX,UA |
| Oct 2024 | 59 | 4 | 0 | 0 | UA,YX |
| Sep 2024 | 85 | 6 | 0 | 0 | YX,UA |
| Aug 2024 | 93 | 13 | 3 | 0 | YX |
| Jul 2024 | 89 | 10 | 0 | 0 | YX |
| Jun 2024 | 90 | 7 | 3 | 0 | YX |
| May 2024 | 44 | 4 | 1 | 0 | YX |
| Jan 2024 | 39 | 8 | 3 | 0 | YX |
| Dec 2023 | 42 | 6 | 1 | 1 | YX |
| Nov 2023 | 31 | 1 | 0 | 0 | YX |
| Oct 2023 | 59 | 8 | 0 | 0 | YX,UA |
| Sep 2023 | 63 | 14 | 3 | 0 | UA,YX |
| Aug 2023 | 93 | 14 | 1 | 0 | UA,YX |
| Jul 2023 | 61 | 9 | 0 | 0 | YX,UA |
Cancellation Rate
1.8%
31 of 1,741 flights
Diversion Rate
0.1%
1 of 1,741 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →PWM - Portland
Full on-time, delay-cause, and seasonal performance for Portland, ME.
Destination airport →Compare the two airports
See IAD and PWM side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–PWM.
Routes with a similar on-time rate
What the Data Says About IAD to PWM
Washington to Portland (IAD to PWM) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.5% on-time rate across 2,863 flights, with delays that do happen averaging 77.0 minutes. The corridor runs roughly 493 miles and is served by 9 carriers. Over the most recent 24 months, 31 of 1,741 flights were cancelled (1.8%) and 1 diverted (0.1%).
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 93% on-time, while Jun 2025 came in at just 76% - a 18-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from IAD to PWM? ▼
What is the cancellation rate for IAD to PWM? ▼
How far is the flight from IAD to PWM? ▼
When is the best time to fly from IAD to PWM? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.