Frontier Airlines is the most reliable airline on the SLC to SAN route with a 90% on-time rate, compared to Southwest Airlines at 77%. Based on 121 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: SLC to SAN
Salt Lake City to San Diego — airline reliability comparison
On-Time Rate by Airline
Frontier Airlines90%
Delta Air Lines83%
SkyWest Airlines83%
Spirit Airlines82%
Southwest Airlines77%
SLC to SAN Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Frontier AirlinesF9Best | 90% | 2.4% | 30m | 121 |
| Delta Air LinesDL | 83% | 0.6% | 59m | 6,229 |
| SkyWest AirlinesOO | 83% | 0.6% | 61m | 1,567 |
| Spirit AirlinesNK | 82% | 1.1% | 93m | 72 |
| Southwest AirlinesWNWorst | 77% | 0.2% | 56m | 1,454 |
Route Overview
82%
Overall On-Time
59m
Avg Delay
0.6%
Cancel Rate
9,480
Total Flights
Flying out of SLC? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.