Alaska Airlines is the most reliable airline on the IAH to SEA route with a 80% on-time rate, compared to United Airlines at 78%. Based on 3,090 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAH to SEA
Houston to Seattle — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines80%
United Airlines78%
IAH to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 80% | 1.3% | 52m | 3,090 |
| United AirlinesUAWorst | 78% | 0.9% | 63m | 4,337 |
Route Overview
78%
Overall On-Time
59m
Avg Delay
1.1%
Cancel Rate
7,429
Total Flights
Flying out of IAH? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.