United Airlines is the most reliable airline on the MIA to IAD route with a 84% on-time rate, compared to Frontier Airlines at 74%. Based on 1,763 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: MIA to IAD
Miami to Washington — airline reliability comparison
On-Time Rate by Airline
United Airlines84%
Frontier Airlines74%
MIA to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 84% | 1.0% | 79m | 1,763 |
| Frontier AirlinesF9Worst | 74% | 1.9% | 62m | 151 |
Route Overview
82%
Overall On-Time
79m
Avg Delay
1.1%
Cancel Rate
1,929
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.