BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
PWM→IAD

Portland, ME (PWM) to Washington, DC (IAD) flight delay odds

83.8% of 691 official scheduled PWM-to-IAD flights arrived on time; 8.7% arrived at least 30 minutes late and 2.5% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALVariable
83.8%arrived on time
8.7%30+ min late
2.5%cancelled
691scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.5%all scheduled flights
120+ minutes late2.0%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival-2.0 mincompleted flights

Which departure time was most reliable for PWM to IAD?

Among qualifying PWM-to-IAD departure window results, Early morning had the highest on-time rate: 92.1% of 140 flights. Evening was lowest at 76.0% across 208 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning14092.1%2.1%2.1%
Late morning17391.3%4.0%1.7%
Afternoon17078.8%10.6%2.4%
Evening20876.0%15.4%3.4%

Which weekday was most reliable for PWM to IAD?

Among qualifying PWM-to-IAD weekday results, Friday had the highest on-time rate: 90.4% of 104 flights. Wednesday was lowest at 76.8% across 95 flights.

DayFlightsOn time30+ minCancelled
Monday10082.0%9.0%4.0%
Tuesday10087.0%6.0%5.0%
Wednesday9576.8%11.6%2.1%
Thursday10484.6%9.6%1.9%
Friday10490.4%3.8%0.0%
Saturday8383.1%10.8%1.2%
Sunday10581.9%10.5%2.9%

Which airline was most reliable for PWM to IAD?

Among qualifying PWM-to-IAD airline results, United Airlines had the highest on-time rate: 94.0% of 50 flights. Republic Airways was lowest at 83.0% across 641 flights.

AirlineFlightsOn time30+ minCancelled
Republic Airways64183.0%9.0%2.7%
United Airlines5094.0%4.0%0.0%

Which month was most reliable for PWM to IAD?

Among qualifying PWM-to-IAD month results, November 2025 had the highest on-time rate: 92.9% of 28 flights. July 2025 was lowest at 71.5% across 123 flights.

MonthFlightsOn time30+ minCancelled
July 202512371.5%16.3%9.8%
August 202510986.2%10.1%0.0%
September 20259483.0%7.4%1.1%
October 20259684.4%4.2%0.0%
November 20252892.9%3.6%3.6%
May 202611992.4%5.0%0.0%
June 202611683.6%8.6%2.6%

What drove PWM to IAD delay minutes?

Late aircraft was the largest recorded PWM-to-IAD delay category, accounting for 48.9% of 6,268 BTS-attributed delay minutes during July 2025–June 2026.

Airline16.1%
Late aircraft48.9%
National airspace28.6%
Weather6.4%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.