Historical on-time performance
Portland to Houston
1,825 miData through Dec 2025Source: 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 delay20 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 1,048 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time86%Medianon timep9020 minCancel1.0%Flights865
- Alaska AirlinesOn-time74%Medianon timep9030 minCancel1.1%Flights183
Why flights run late
Delay causes
- Airline34%
- Weather1%
- Air traffic (NAS)33%
- Late aircraft32%
- Security1%
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 → IAH
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 77% to 92% on time.
- Mornings92% on time · p90 5 min · 1,060 flights
- Afternoons86% on time · p90 20 min · 96 flights · limited
- Overnights82% on time · p90 40 min · 429 flights
- Middays77% on time · p90 35 min · 1,228 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 87% on time.
- Saturdays87% on time · p90 20 min · 405 flights
- Tuesdays87% on time · p90 15 min · 401 flights
- Fridays84% on time · p90 30 min · 403 flights
- Mondays84% on time · p90 25 min · 402 flights
- Sundays83% on time · p90 25 min · 405 flights
- Wednesdays82% on time · p90 25 min · 397 flights
- Thursdays81% on time · p90 25 min · 400 flights
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