Route · PWM → IAD · 2020–2025 BTS data
Portland to Washington
The PWM–IAD corridor (Portland, ME → Washington, DC) runs ahead of the national average, served by 8 carriers across roughly 493 miles.
Data updated 2026-06-13
- 86.4%
- On-time
- +7.4 pts
- vs US avg
- 85 min
- Delay when late
- 2,820
- Flights
Cancelled
2.0%
Best Month
Sep 2024 93%
Worst Month
Jul 2023 75%
Distance
493 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Oct 2025 | 96 | 15 | 0 | 0 | YX |
| Sep 2025 | 94 | 15 | 1 | 0 | YX |
| Aug 2025 | 109 | 15 | 0 | 0 | YX,UA |
| Jul 2025 | 123 | 22 | 12 | 1 | UA,YX |
| Jun 2025 | 126 | 26 | 1 | 0 | UA,YX |
| May 2025 | 136 | 18 | 2 | 0 | YX |
| Mar 2025 | 30 | 2 | 0 | 0 | YX |
| Dec 2024 | 46 | 8 | 0 | 0 | UA,YX |
| Nov 2024 | 47 | 6 | 0 | 0 | YX,UA |
| Oct 2024 | 59 | 5 | 0 | 0 | UA,YX |
| Sep 2024 | 85 | 6 | 0 | 0 | YX,UA |
| Aug 2024 | 93 | 14 | 5 | 2 | YX |
| Jul 2024 | 93 | 9 | 3 | 0 | YX |
| Jun 2024 | 90 | 7 | 3 | 0 | YX |
| May 2024 | 44 | 2 | 1 | 0 | YX |
| Jan 2024 | 40 | 7 | 3 | 0 | YX |
| Dec 2023 | 42 | 4 | 0 | 0 | YX |
| Nov 2023 | 30 | 2 | 0 | 0 | YX |
| Oct 2023 | 59 | 5 | 0 | 0 | YX,UA |
| Sep 2023 | 65 | 13 | 3 | 0 | UA,YX |
| Aug 2023 | 92 | 9 | 0 | 0 | UA,YX |
| Jul 2023 | 61 | 15 | 0 | 0 | YX,UA |
| Jun 2023 | 80 | 16 | 2 | 0 | UA,YX |
| May 2023 | 50 | 2 | 0 | 0 | YX |
Cancellation Rate
2.0%
36 of 1,790 flights
Diversion Rate
0.2%
3 of 1,790 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
PWM - Portland
Full on-time, delay-cause, and seasonal performance for Portland, ME.
Origin airport →IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Destination airport →Compare the two airports
See PWM and IAD side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to PWM–IAD.
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What the Data Says About PWM to IAD
Portland to Washington (PWM to IAD) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.4% on-time rate across 2,820 flights, with delays that do happen averaging 84.8 minutes. The corridor runs roughly 493 miles and is served by 8 carriers. Over the most recent 24 months, 36 of 1,790 flights were cancelled (2.0%) and 3 diverted (0.2%).
The monthly split is wide on this route: Sep 2024 posted the strongest performance at 93% on-time, while Jul 2023 came in at just 75% - a 18-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.