United Airlines is the most reliable airline on the SEA to IAH route with a 85% on-time rate, compared to Alaska Airlines at 74%. Based on 4,336 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to IAH
Seattle to Houston — airline reliability comparison
On-Time Rate by Airline
United Airlines85%
Alaska Airlines74%
SEA to IAH Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 85% | 1.1% | 78m | 4,336 |
| Alaska AirlinesASWorst | 74% | 1.1% | 43m | 3,091 |
Route Overview
80%
Overall On-Time
60m
Avg Delay
1.2%
Cancel Rate
7,430
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.