United Airlines is the most reliable airline on the IAD to SAN route with a 85% on-time rate, compared to Alaska Airlines at 77%. Based on 4,090 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to SAN
Washington to San Diego — airline reliability comparison
On-Time Rate by Airline
United Airlines85%
Alaska Airlines77%
IAD to SAN Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 85% | 0.9% | 65m | 4,090 |
| Alaska AirlinesASWorst | 77% | 1.4% | 48m | 1,135 |
Route Overview
84%
Overall On-Time
61m
Avg Delay
1.1%
Cancel Rate
5,225
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.