Historical on-time performance
Washington to Portland
2,327 miData through May 2026Source: US DOT · BTS
Flights on IAD–PDX arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 244 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time75%Medianon timep9065 minCancel0.0%Flights244
Why flights run late
Delay causes
- Airline29%
- Weather25%
- Air traffic (NAS)25%
- Late aircraft20%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline56%
- Weather33%
- Air traffic (NAS)11%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 9 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → PDX
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best day of week
On-time rates are fairly even by day on this route — ranging from 65% to 82% on time.
- Sundays82% on time · p90 60 min · 127 flights · limited
- Fridays81% on time · p90 70 min · 130 flights · limited
- Wednesdays78% on time · p90 55 min · 125 flights · limited
- Tuesdays78% on time · p90 35 min · 125 flights · limited
- Mondays76% on time · p90 55 min · 118 flights · limited
- Saturdays74% on time · p90 80 min · 130 flights · limited
- Thursdays65% on time · p90 55 min · 121 flights · limited
Keep exploring