Routes › Washington (IAD) › IAD to PWM
Route · 12 months to July 2026
Washington to Portland: on-time record
Washington Dulles International to Portland International Jetport
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live flight status.
86.8% of scheduled IAD to PWM flights arrived on time in the 12 months to July 2026. The figure covers 787 flights between Washington and Portland by carriers that report to BTS, a distance of 493 miles.
That is 10.8 points above the national on-time share of 76.0% for the same period and 6.7 points above the 80.1% recorded for all departures from IAD. Flights that did arrive were 3.1 minutes early on average, and 1.9% of scheduled flights were cancelled (national: 1.8%).
2 reporting carriers flew the route at least 60 times. Republic Airline had the highest on-time share at 88.1% of 717 flights; United Airlines had the lowest at 72.9% of 70.
By scheduled departure hour (local time at IAD), flights leaving from 8 am to 9 am had the highest on-time share, 94.3%; those leaving from 10 pm to 11 pm had the lowest, 78.6%.
The on-time share is up 4.7 points on the previous 12 months (82.1%); cancellations moved from 2.4% to 1.9%.
Of the delay minutes that carriers assigned to a BTS cause category on this route, late-arriving aircraft 36%, air carrier 34% and national aviation system 18%.
- On time 86.8%
- Arrived 15+ minutes late 11.3%
- Cancelled 1.9%
- Diverted 0.0%
Airlines on the route compared
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| YX Republic Airline | 717 | 91% | 88.1% | -4.8 min | 2.1% |
| UA United Airlines | 70 | 9% | 72.9% | 14.0 min | 0.0% |
Carriers with at least 24 flights in the 12 months to July 2026. The on-time pill is green when a carrier is at or above the route's overall share. Regional carriers operate flights sold under larger airlines' brands; BTS lists the carrier that operated the flight.
Compared with the airports and the nation
| Measure | IAD to PWM | All departures from IAD | All arrivals at PWM | All reported flights |
|---|---|---|---|---|
| Arrived on time | 86.8% | 80.1% | 76.2% | 76.0% |
| Arrived 15+ minutes late | 11.3% | 18.2% | 21.2% | 21.9% |
| Cancelled | 1.9% | 1.4% | 2.6% | 1.8% |
| Diverted | 0.0% | 0.3% | 0.1% | 0.3% |
| Average arrival delay | -3.1 min | 4.8 min | 6.1 min | 8.1 min |
| Delay minutes per 100 flights | 861 | 1,514 | 1,481 | 1,684 |
| Scheduled flights | 787 | 58,031 | 10,924 | 7,043,858 |
12 months to July 2026. Delay minutes count late arrivals only (an early arrival is zero), so the per-100-flights row is a normalised total rather than an average of early and late.
The return direction, PWM to IAD, recorded 84.3% on time across 686 flights in the same period.
Month by month
Year on year: on time 86.8% against 82.1% (+4.7 pts), cancelled 1.9% against 2.4%, flights 787 against 795.
By scheduled departure hour
Delay causes
Seasonality
| Calendar month | Flights | On time | Cancelled | Avg arrival delay | Years in sample |
|---|---|---|---|---|---|
| Jan | 83 | 74.7% | 7.2% | 1.7 min | 3 |
| Feb | 72 | 87.5% | 2.8% | -4.8 min | 3 |
| Mar | 35 | 82.9% | 0.0% | -4.7 min | 2 |
| Apr | 30 | 96.7% | 0.0% | -6.3 min | 2 |
| May | 288 | 87.8% | 1.0% | 0.4 min | 3 |
| Jun | 324 | 83.0% | 1.5% | 3.2 min | 3 |
| Jul | 321 | 76.0% | 5.9% | 13.3 min | 3 |
| Aug | 294 | 86.1% | 1.7% | -3.0 min | 3 |
| Sep | 242 | 87.2% | 1.7% | -1.3 min | 3 |
| Oct | 218 | 89.4% | 0.0% | -6.3 min | 3 |
| Nov | 133 | 93.2% | 0.8% | -9.8 min | 3 |
| Dec | 120 | 79.2% | 0.8% | 11.0 min | 3 |
Each calendar month summed across the 36 months on file, so most rows combine three years. The pill compares the month with the route's own 12-month share.
Other routes from Washington (IAD)
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| IAD–ATL | Washington to Atlanta | 3,989 | 76.7% | 8.0 min | 2.1% |
| IAD–DEN | Washington to Denver | 3,465 | 82.1% | 1.9 min | 0.5% |
| IAD–SFO | Washington to San Francisco | 2,729 | 78.0% | 6.0 min | 0.8% |
| IAD–LAX | Washington to Los Angeles | 2,472 | 83.0% | -1.9 min | 0.8% |
| IAD–MCO | Washington to Orlando | 2,177 | 79.9% | 3.6 min | 1.1% |
| IAD–ORD | Washington to Chicago | 2,085 | 74.4% | 12.2 min | 1.0% |
| IAD–CLT | Washington to Charlotte | 1,988 | 81.1% | 2.9 min | 2.6% |
| IAD–DFW | Washington to Dallas/Fort Worth | 1,951 | 75.2% | 11.4 min | 1.9% |
All 78 routes and the airport record for IAD · airport record for PWM
Questions and answers
How often are flights from Washington to Portland on time?
86.8% of the 787 flights scheduled from IAD to PWM in the 12 months to July 2026 arrived less than 15 minutes after their scheduled time. The national share for the same period was 76.0%. Cancelled and diverted flights count as not on time.
Which airline has the highest on-time share from IAD to PWM?
Among reporting carriers with at least 60 flights on the route, Republic Airline had the highest on-time share (88.1%), followed by United Airlines (72.9%). Differences of a point or two on a few hundred flights are small.
What causes delays between Washington and Portland?
For flights that arrived 15 or more minutes late, carriers attributed the delay minutes as follows: late-arriving aircraft 36%, air carrier 34%, national aviation system 18%, extreme weather 12%, security 0%. The categories are the carriers' own reports to BTS; weather that slows the wider system is usually recorded under the National Aviation System rather than extreme weather.
What time of day has the highest on-time share from IAD?
Flights scheduled to leave IAD from 8 am to 9 am arrived on time 94.3% of the time, the highest of any hour with enough flights to compare. The lowest was 10 pm to 11 pm at 78.6%. Delays tend to build through the day as late aircraft carry over to later flights.
Is it getting better?
The on-time share for the 12 months to July 2026 was 86.8%, up 4.7 points on the previous 12 months (82.1%). The monthly chart on this page shows each of the last 36 months. Across those months, November had the highest on-time share (93.2%) and January the lowest (74.7%).
Where does this data come from?
Every figure is computed from the Bureau of Transportation Statistics Reporting Carrier On-Time Performance files, which list each scheduled domestic flight by the carriers required to report. This page covers August 2023 to July 2026. It shows totals and averages only; it is not a live flight-status service.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026, a US government work in the public domain. Figures are totals and averages over all scheduled flights by reporting carriers on the route; no individual flight or aircraft is identified. Times are local to the departure airport. The load factor and passenger counts from the BTS T-100 series are not included in this edition. See the methodology; report processing errors through corrections.