Flight Check

Best Airline: LAS to IAD

Las Vegas to Washington — airline reliability comparison

United Airlines is the most reliable airline on the LAS to IAD route with a 84% on-time rate, compared to Frontier Airlines at 70%. Based on 3,401 flights tracked.

This route involves high-congestion airports, which can affect reliability regardless of airline.

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

United Airlines84%
Frontier Airlines70%

LAS to IAD Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest84%1.1%67m3,401
Frontier AirlinesF9Worst70%0.0%61m185

Route Overview

84%
Overall On-Time
67m
Avg Delay
1%
Cancel Rate
3,587
Total Flights
LAS to IAD Route DetailsReturn: IAD to LAS
LAS AirportIAD Airport

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Data last updated October 2026. Source: Bureau of Transportation Statistics.