Historical on-time performance
Seattle to Houston
1,874 miData through May 2026Source: US DOT · BTS
Flights on SEA–IAH arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 2,106 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time82%Medianon timep9030 minCancel0.9%Flights1,251
- Alaska AirlinesOn-time70%Medianon timep9040 minCancel0.8%Flights855
Why flights run late
Delay causes
- Airline38%
- Weather1%
- Air traffic (NAS)29%
- Late aircraft32%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline61%
- Weather39%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 18 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 SEA → 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 — 86% on time.
- Mornings86% on time · p90 20 min · 1,314 flights
- Afternoons80% on time · p90 30 min · 448 flights
- Overnights77% on time · p90 30 min · 1,634 flights
- Evenings74% on time · p90 40 min · 998 flights
- Middays72% on time · p90 40 min · 1,872 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 82% on time.
- Wednesdays82% on time · p90 25 min · 885 flights
- Tuesdays80% on time · p90 30 min · 873 flights
- Mondays78% on time · p90 30 min · 900 flights
- Saturdays78% on time · p90 35 min · 864 flights
- Thursdays76% on time · p90 40 min · 912 flights
- Sundays76% on time · p90 35 min · 913 flights
- Fridays72% on time · p90 40 min · 919 flights
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