Delta Air Lines is the most reliable airline on the SAN to SLC route with a 87% on-time rate, compared to Southwest Airlines at 78%. Based on 6,230 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SAN to SLC
San Diego to Salt Lake City — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines87%
Frontier Airlines85%
Spirit Airlines81%
SkyWest Airlines78%
Southwest Airlines78%
SAN to SLC Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 87% | 0.7% | 85m | 6,230 |
| Frontier AirlinesF9 | 85% | 0.7% | 91m | 121 |
| Spirit AirlinesNK | 81% | 1.1% | 78m | 73 |
| SkyWest AirlinesOO | 78% | 0.5% | 59m | 1,571 |
| Southwest AirlinesWNWorst | 78% | 0.3% | 49m | 1,447 |
Route Overview
84%
Overall On-Time
69m
Avg Delay
0.6%
Cancel Rate
9,477
Total Flights
Flying out of SAN? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.