IAD (Washington) to PWM (Portland) flights arrive on time 87% of the time. The most reliable airline on this route is United Airlines at 90%. The average delay is 74 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.IAD → PWM
IAD (Washington) to PWM (Portland)
IAD → PWM on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is usually on time. About 87% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — United Airlines leads slightly at 90% vs Republic Airways at 88%.
Airline Comparison
United Airlines leads at 90% on time; Republic Airways trails at 88%.
Accurate?
Good to know
Departing from IAD
83% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. IAD has long runway queues.
TSA is currently ~8 min. Best time: 4 AM (about 5 min).
Arriving at PWM
81% on timeWhen flights into PWM are late, the average delay is 76 minutes. Build buffer if you have ground plans.
If connecting at PWM: TSA is ~11 min right now. Allow at least 60 minutes for a domestic connection.
PWM has a 2.8% cancellation rate — keep the airline app handy for rebooking.
Flight cancelled or delayed?
Check what United Airlines owes you — refund rights, action plan, complaint email. Free.
Let us watch your flight
We worry about delays, TSA, weather, and gates so you don't have to.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated May 2026. Source: Bureau of Transportation Statistics.