Delta Air Lines is the most reliable airline on the STL to SLC route with a 90% on-time rate, compared to SkyWest Airlines at 89%. Based on 3,429 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to SLC
St. Louis to Salt Lake City — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines90%
SkyWest Airlines89%
STL to SLC Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 90% | 0.7% | 101m | 3,429 |
| SkyWest AirlinesOOWorst | 89% | 0.0% | 26m | 18 |
Route Overview
89%
Overall On-Time
100m
Avg Delay
0.6%
Cancel Rate
3,514
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.