Historical on-time performance
Washington to Portland
2,327 miData through Dec 2025Source: 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 delay70 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 timep9070 minCancel0.0%Flights244
Why flights run late
Delay causes
- Airline31%
- Weather26%
- Air traffic (NAS)21%
- Late aircraft22%
- Security0%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 83% on time.
- Wednesdays83% on time · p90 55 min · 126 flights · limited
- Fridays81% on time · p90 70 min · 129 flights · limited
- Sundays80% on time · p90 60 min · 127 flights · limited
- Mondays79% on time · p90 40 min · 119 flights · limited
- Tuesdays77% on time · p90 35 min · 127 flights · limited
- Saturdays73% on time · p90 80 min · 129 flights · limited
- Thursdays66% on time · p90 65 min · 119 flights · limited
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