Alaska Airlines is the most reliable airline on the MIA to SEA route with a 72% on-time rate, compared to Delta Air Lines at 66%. Based on 1,365 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: MIA to SEA
Miami to Seattle — airline reliability comparison
On-Time Rate by Airline
Alaska Airlines72%
American Airlines67%
Delta Air Lines66%
MIA to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 72% | 2.0% | 61m | 1,365 |
| American AirlinesAA | 67% | 0.7% | 76m | 1,441 |
| Delta Air LinesDLWorst | 66% | 1.1% | 77m | 591 |
Route Overview
69%
Overall On-Time
70m
Avg Delay
1.3%
Cancel Rate
3,397
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.