Historical on-time performance
Seattle to Houston
1,874 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–IAH arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 2,111 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time80%Medianon timep9030 minCancel0.9%Flights1,254
- Alaska AirlinesOn-time67%Medianon timep9045 minCancel1.2%Flights857
Why flights run late
Delay causes
- Airline39%
- Weather1%
- Air traffic (NAS)28%
- Late aircraft32%
- 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 SEA → 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 71% to 83% on time.
- Mornings83% on time · p90 20 min · 1,297 flights
- Afternoons82% on time · p90 25 min · 554 flights
- Overnights77% on time · p90 30 min · 1,737 flights
- Evenings73% on time · p90 40 min · 901 flights
- Middays71% on time · p90 45 min · 1,769 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 81% on time.
- Wednesdays81% on time · p90 30 min · 889 flights
- Tuesdays79% on time · p90 30 min · 881 flights
- Mondays77% on time · p90 35 min · 904 flights
- Saturdays77% on time · p90 35 min · 860 flights
- Thursdays76% on time · p90 40 min · 901 flights
- Sundays74% on time · p90 35 min · 914 flights
- Fridays72% on time · p90 40 min · 909 flights
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