Delta Air Lines is the most reliable airline on the RDU to MIA route with a 85% on-time rate, compared to Frontier Airlines at 69%. Based on 1,300 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: RDU to MIA
Raleigh to Miami — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines85%
Endeavor Air81%
80%
American Airlines79%
Spirit Airlines75%
Frontier Airlines69%
RDU to MIA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 85% | 1.5% | 81m | 1,300 |
| Endeavor Air9E | 81% | 0.0% | 56m | 16 |
| MQ | 80% | 1.1% | 62m | 789 |
| American AirlinesAA | 79% | 1.4% | 89m | 5,620 |
| Spirit AirlinesNK | 75% | 1.6% | 87m | 179 |
| Frontier AirlinesF9Worst | 69% | 3.7% | 102m | 464 |
Route Overview
79%
Overall On-Time
84m
Avg Delay
1.5%
Cancel Rate
8,515
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.