United Airlines is the most reliable airline on the SLC to IAD route with a 88% on-time rate, compared to Delta Air Lines at 83%. Based on 572 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SLC to IAD
Salt Lake City to Washington — airline reliability comparison
On-Time Rate by Airline
United Airlines88%
Delta Air Lines83%
SLC to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 88% | 1.5% | 78m | 572 |
| Delta Air LinesDLWorst | 83% | 0.9% | 78m | 1,308 |
Route Overview
85%
Overall On-Time
75m
Avg Delay
1.1%
Cancel Rate
1,880
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.