IAD to PDX flight delays & on-time performance
Nonstop flights from Washington Dulles International Airport to Portland International Airport · 2,327 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAD or PDX right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Washington (IAD) to Portland (PDX) arrived on time 76% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.7% were cancelled, and 10% arrived an hour or more late.
- United Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 5pm did best (79% on time); around 7pm did worst (57%).
- Friday was the most reliable day to fly (84% on time) and Monday the least (69%).
- The largest source of delay minutes was late-arriving aircraft (31%).
Which airline is most on time from IAD to PDX?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 76% | 0.7% | 20 min | 10.0% | 291 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5pm79%232 flights
- 6pm66%36 flights
- 7pm57%23 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday69%0.0% cancelled
- Tuesday78%0.0% cancelled
- Wednesday73%0.0% cancelled
- Thursday74%0.0% cancelled
- Friday84%0.0% cancelled
- Saturday74%0.0% cancelled
- Sunday80%4.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft31%
- Airline (crew, maintenance, cleaning, fueling)26%
- Air traffic control & airport congestion23%
- Extreme weather20%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Air traffic control & airport congestion0%
- Security0%
IAD to PDX: common questions
- How often are IAD to PDX flights on time?
- 76% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Washington to Portland cancelled?
- 0.7% of scheduled flights were cancelled (2 of 291).
- How long are typical delays?
- Across all flights the average arrival delay was 20 min (early arrivals count as zero). Flights that were late arrived 77 min behind schedule on average, and 10.0% of flights were an hour or more late.
- How long is taxi time at IAD?
- Flights on this route spent 25 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PDX to IAD — 93% on time
More flights from Washington
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAD → PDX, nonstop flights by US airlines that report to the DOT. How we calculate this.