Historical on-time performance
Portland to Washington
2,327 miData through Dec 2025Source: US DOT · BTS
Flights on PDX–IAD arrive on time 86% of the time over the last 12 months.
On-time rate86%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 245 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time86%Medianon timep9035 minCancel0.4%Flights245
Why flights run late
Delay causes
- Airline53%
- Weather3%
- Air traffic (NAS)8%
- Late aircraft36%
- 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 PDX → IAD
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 92% on time.
- Mornings92% on time · p90 10 min · 474 flights
- Overnights84% on time · p90 40 min · 394 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 84% to 94% on time.
- Tuesdays94% on time · p90 10 min · 116 flights · limited
- Wednesdays92% on time · p90 5 min · 128 flights · limited
- Sundays91% on time · p90 10 min · 138 flights · limited
- Mondays87% on time · p90 30 min · 120 flights · limited
- Saturdays85% on time · p90 25 min · 129 flights · limited
- Thursdays85% on time · p90 20 min · 128 flights · limited
- Fridays84% on time · p90 30 min · 119 flights · limited
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