Atlanta to San Diego — airline reliability comparison
Delta Air Lines is the most reliable airline on the ATL to SAN route with a 78% on-time rate, compared to Frontier Airlines at 49%. Based on 7,491 flights tracked.
This route involves high-congestion airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 78% | 0.6% | 49m | 7,491 |
| Southwest AirlinesWN | 72% | 0.0% | 41m | 25 |
| Alaska AirlinesAS | 71% | 1.3% | 52m | 640 |
| Frontier AirlinesF9Worst | 49% | 1.5% | 50m | 150 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.