Historical on-time performance
Portland to Houston
1,825 miData through May 2026Source: US DOT · BTS
Flights on PDX–IAH arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 1,129 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time85%Medianon timep9020 minCancel0.9%Flights885
- Alaska AirlinesOn-time79%Medianon timep9025 minCancel0.8%Flights244
Why flights run late
Delay causes
- Airline29%
- Weather1%
- Air traffic (NAS)37%
- Late aircraft33%
- Security1%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline40%
- Weather60%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 10 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 PDX → IAH
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 92% on time.
- Mornings92% on time · p90 5 min · 1,116 flights
- Afternoons84% on time · p90 25 min · 125 flights · limited
- Overnights83% on time · p90 40 min · 458 flights
- Middays79% on time · p90 30 min · 1,286 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 83% to 88% on time.
- Saturdays88% on time · p90 15 min · 422 flights
- Tuesdays88% on time · p90 15 min · 423 flights
- Mondays84% on time · p90 25 min · 426 flights
- Fridays84% on time · p90 30 min · 433 flights
- Wednesdays84% on time · p90 20 min · 420 flights
- Sundays83% on time · p90 25 min · 431 flights
- Thursdays83% on time · p90 20 min · 430 flights
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