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

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

Historically, 65.9% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,153 flights.

HISTORICAL ROUTE SIGNALVariable
65.9%arrived on time
20.0%30+ min late
3.9%cancelled
1,153scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.8%all scheduled flights
120+ minutes late4.1%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+14.4 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning11068.2%17.3%5.5%
Late morning32973.9%14.6%2.4%
Afternoon37766.6%19.9%3.4%
Night31154.3%28.0%5.5%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday16861.3%23.8%6.5%
Tuesday17171.3%12.3%5.8%
Wednesday16867.3%18.5%2.4%
Thursday16564.2%24.2%2.4%
Friday16561.8%21.8%2.4%
Saturday14775.5%15.6%2.0%
Sunday16960.9%23.7%5.3%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines65568.1%19.7%2.3%
PSA Airlines39463.5%20.1%4.6%
Republic Airways10060.0%23.0%12.0%
Envoy Air4100.0%0.0%0.0%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 20258854.5%20.5%18.2%
August 202511475.4%17.5%0.0%
September 202511672.4%17.2%0.0%
October 202512166.1%15.7%1.7%
November 20258881.8%9.1%0.0%
December 20259066.7%20.0%2.2%
January 20269361.3%24.7%7.5%
February 20268153.1%27.2%4.9%
March 20268859.1%22.7%8.0%
April 20268660.5%24.4%0.0%
May 20269463.8%24.5%2.1%
June 20269470.2%20.2%5.3%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline26.3%
Late aircraft58.5%
National airspace12.3%
Weather2.8%
Security0.2%
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.