Republic Airways is the most reliable airline on the IAD to PWM route with a 89% on-time rate, compared to United Airlines at 78%. Based on 2,141 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to PWM
Washington to Portland — airline reliability comparison
On-Time Rate by Airline
Republic Airways89%
United Airlines78%
IAD to PWM Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Republic AirwaysYXBest | 89% | 1.9% | 78m | 2,141 |
| United AirlinesUAWorst | 78% | 0.6% | 60m | 279 |
Route Overview
87%
Overall On-Time
79m
Avg Delay
2%
Cancel Rate
2,437
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.