Flight Check

Best Airline: LAS to IAH

Las Vegas to Houston — airline reliability comparison

United Airlines is the most reliable airline on the LAS to IAH route with a 85% on-time rate, compared to Southwest Airlines at 74%. Based on 8,628 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 Airlines85%
Frontier Airlines77%
Spirit Airlines75%
Southwest Airlines74%

LAS to IAH Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest85%1.0%76m8,628
Frontier AirlinesF977%1.4%59m1,081
Spirit AirlinesNK75%1.5%75m3,087
Southwest AirlinesWNWorst74%0.8%54m1,265

Route Overview

81%
Overall On-Time
71m
Avg Delay
1.1%
Cancel Rate
14,087
Total Flights
LAS to IAH Route DetailsReturn: IAH to LAS
LAS AirportIAH Airport

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