Delta Air Lines is the most reliable airline on the SLC to STL route with a 84% on-time rate, compared to SkyWest Airlines at 67%. Based on 3,429 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SLC to STL
Salt Lake City to St. Louis — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines84%
SkyWest Airlines67%
SLC to STL Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 84% | 0.4% | 61m | 3,429 |
| SkyWest AirlinesOOWorst | 67% | 0.0% | 29m | 18 |
Route Overview
84%
Overall On-Time
60m
Avg Delay
0.4%
Cancel Rate
3,514
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.