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

Baltimore, MD (BWI) to Portland, ME (PWM) flight delay odds

Historically, 78.2% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,341 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
78.2%arrived on time
11.6%30+ min late
1.3%cancelled
1,341scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.1%all scheduled flights
120+ minutes late1.3%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+4.5 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 morning10995.4%0.9%0.0%
Late morning33090.0%3.3%0.6%
Afternoon45277.9%12.2%0.9%
Evening18175.7%14.9%1.7%
Night26958.7%23.0%3.3%

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
Monday19977.9%12.1%2.5%
Tuesday18682.3%9.7%0.0%
Wednesday18082.8%10.6%0.0%
Thursday19772.1%14.7%1.5%
Friday20380.8%10.8%1.0%
Saturday18582.2%8.6%0.5%
Sunday19169.6%14.7%3.7%

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
Southwest Airlines1,34178.2%11.6%1.3%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202512351.2%29.3%4.1%
August 202513581.5%12.6%0.0%
September 202512187.6%5.8%0.0%
October 202512385.4%4.9%0.0%
November 202510783.2%6.5%0.0%
December 202510878.7%12.0%0.0%
January 20269783.5%10.3%4.1%
February 20269480.9%8.5%4.3%
March 202610676.4%12.3%3.8%
April 202610377.7%9.7%0.0%
May 202610675.5%10.4%0.0%
June 202611878.0%15.3%0.8%

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.

Airline31.4%
Late aircraft51.0%
National airspace10.3%
Weather7.3%
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.