Delta Air Lines is the most reliable airline on the RDU to SEA route with a 89% on-time rate, compared to Alaska Airlines at 78%. Based on 1,305 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: RDU to SEA
Raleigh to Seattle — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines89%
Alaska Airlines78%
RDU to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 89% | 0.9% | 73m | 1,305 |
| Alaska AirlinesASWorst | 78% | 1.6% | 49m | 1,859 |
Route Overview
82%
Overall On-Time
59m
Avg Delay
1.1%
Cancel Rate
3,164
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.