Spirit Airlines is the most reliable airline on the MIA to AUS route with a 86% on-time rate, compared to Frontier Airlines at 67%. Based on 31 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: MIA to AUS
Miami to Austin — airline reliability comparison
On-Time Rate by Airline
Spirit Airlines86%
76%
American Airlines73%
Southwest Airlines71%
Delta Air Lines69%
Frontier Airlines67%
MIA to AUS Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Spirit AirlinesNKBest | 86% | 6.5% | 84m | 31 |
| MQ | 76% | 0.4% | 46m | 560 |
| American AirlinesAA | 73% | 1.3% | 77m | 4,832 |
| Southwest AirlinesWN | 71% | 0.4% | 61m | 1,273 |
| Delta Air LinesDL | 69% | 0.7% | 95m | 253 |
| Frontier AirlinesF9Worst | 67% | 0.0% | 46m | 12 |
Route Overview
73%
Overall On-Time
73m
Avg Delay
1.1%
Cancel Rate
7,050
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.