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

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

78.2% of 1,341 official scheduled BWI-to-PWM flights arrived on time; 11.6% arrived at least 30 minutes late and 1.3% 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 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

Which departure time was most reliable for BWI to PWM?

Among qualifying BWI-to-PWM departure window results, Early morning had the highest on-time rate: 95.4% of 109 flights. Night was lowest at 58.7% across 269 flights.

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%

Which weekday was most reliable for BWI to PWM?

Among qualifying BWI-to-PWM weekday results, Wednesday had the highest on-time rate: 82.8% of 180 flights. Sunday was lowest at 69.6% across 191 flights.

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%

Which airline was most reliable for BWI to PWM?

Only Southwest Airlines met the BWI-to-PWM airline threshold: 78.2% of 1,341 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,34178.2%11.6%1.3%

Which month was most reliable for BWI to PWM?

Among qualifying BWI-to-PWM month results, September 2025 had the highest on-time rate: 87.6% of 121 flights. July 2025 was lowest at 51.2% across 123 flights.

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 BWI to PWM delay minutes?

Late aircraft was the largest recorded BWI-to-PWM delay category, accounting for 51.0% of 13,543 BTS-attributed delay minutes during July 2025–June 2026.

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.