Delta Air Lines is the most reliable airline on the SEA to RDU route with a 83% on-time rate, compared to Alaska Airlines at 81%. Based on 1,305 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SEA to RDU
Seattle to Raleigh — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines83%
Alaska Airlines81%
SEA to RDU Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 83% | 0.8% | 53m | 1,305 |
| Alaska AirlinesASWorst | 81% | 0.9% | 38m | 1,860 |
Route Overview
81%
Overall On-Time
46m
Avg Delay
0.8%
Cancel Rate
3,165
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.