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

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

80.8% of 1,341 official scheduled PWM-to-BWI flights arrived on time; 8.5% arrived at least 30 minutes late and 0.9% 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 SIGNALLower disruption
80.8%arrived on time
8.5%30+ min late
0.9%cancelled
1,341scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.0%all scheduled flights
120+ minutes late2.0%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+6.5 mincompleted flights

Which departure time was most reliable for PWM to BWI?

Among qualifying PWM-to-BWI departure window results, Late morning had the highest on-time rate: 88.5% of 174 flights. Evening was lowest at 63.6% across 165 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning40888.5%4.2%1.0%
Late morning17488.5%4.6%0.6%
Afternoon59478.1%10.3%1.2%
Evening16563.6%17.0%0.0%

Which weekday was most reliable for PWM to BWI?

Among qualifying PWM-to-BWI weekday results, Wednesday had the highest on-time rate: 87.8% of 180 flights. Monday was lowest at 78.4% across 199 flights.

DayFlightsOn time30+ minCancelled
Monday19978.4%10.1%2.0%
Tuesday18679.0%10.8%0.5%
Wednesday18087.8%6.7%0.0%
Thursday19680.1%6.1%1.0%
Friday20379.3%9.4%0.5%
Saturday18683.3%7.5%0.0%
Sunday19178.5%8.9%2.1%

Which airline was most reliable for PWM to BWI?

Only Southwest Airlines met the PWM-to-BWI airline threshold: 80.8% of 1,341 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,34180.8%8.5%0.9%

Which month was most reliable for PWM to BWI?

Among qualifying PWM-to-BWI month results, September 2025 had the highest on-time rate: 90.9% of 121 flights. July 2025 was lowest at 63.4% across 123 flights.

MonthFlightsOn time30+ minCancelled
July 202512363.4%21.1%2.4%
August 202513583.0%5.9%0.0%
September 202512190.9%3.3%0.0%
October 202512389.4%3.3%0.0%
November 202510887.0%5.6%0.0%
December 202510873.1%10.2%0.9%
January 20269775.3%14.4%4.1%
February 20269481.9%6.4%4.3%
March 202610676.4%10.4%0.0%
April 202610379.6%7.8%0.0%
May 202610682.1%8.5%0.0%
June 202611786.3%6.0%0.0%

What drove PWM to BWI delay minutes?

Late aircraft was the largest recorded PWM-to-BWI delay category, accounting for 34.9% of 13,868 BTS-attributed delay minutes during July 2025–June 2026.

Airline34.0%
Late aircraft34.9%
National airspace24.5%
Weather6.0%
Security0.5%
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.