United Airlines is the most reliable airline on the PHX to IAD route with a 87% on-time rate, compared to Southwest Airlines at 82%. Based on 2,656 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: PHX to IAD
Phoenix to Washington — airline reliability comparison
On-Time Rate by Airline
United Airlines87%
Southwest Airlines82%
PHX to IAD Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| United AirlinesUABest | 87% | 1.4% | 65m | 2,656 |
| Southwest AirlinesWNWorst | 82% | 0.1% | 39m | 764 |
Route Overview
86%
Overall On-Time
59m
Avg Delay
0.8%
Cancel Rate
3,424
Total Flights
Flying out of PHX? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.