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

Portland, ME (PWM) to Atlanta, GA (ATL) flight delay odds

80.1% of 642 official scheduled PWM-to-ATL flights arrived on time; 11.4% arrived at least 30 minutes late and 1.1% 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
80.1%arrived on time
11.4%30+ min late
1.1%cancelled
642scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.8%all scheduled flights
120+ minutes late2.3%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+4.5 mincompleted flights

Which departure time was most reliable for PWM to ATL?

Among qualifying PWM-to-ATL departure window results, Early morning had the highest on-time rate: 87.1% of 365 flights. Evening was lowest at 66.2% across 68 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36587.1%6.8%1.1%
Afternoon20972.2%16.3%0.5%
Evening6866.2%20.6%2.9%

Which weekday was most reliable for PWM to ATL?

Among qualifying PWM-to-ATL weekday results, Friday had the highest on-time rate: 87.6% of 89 flights. Monday was lowest at 71.4% across 91 flights.

DayFlightsOn time30+ minCancelled
Monday9171.4%13.2%2.2%
Tuesday9378.5%12.9%1.1%
Wednesday9084.4%7.8%0.0%
Thursday9083.3%8.9%0.0%
Friday8987.6%6.7%2.2%
Saturday9778.4%15.5%1.0%
Sunday9277.2%14.1%1.1%

Which airline was most reliable for PWM to ATL?

Only Delta Air Lines met the PWM-to-ATL airline threshold: 80.1% of 642 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines64280.1%11.4%1.1%

Which month was most reliable for PWM to ATL?

Among qualifying PWM-to-ATL month results, April 2026 had the highest on-time rate: 96.9% of 32 flights. July 2025 was lowest at 62.0% across 92 flights.

MonthFlightsOn time30+ minCancelled
July 20259262.0%25.0%2.2%
August 20257581.3%9.3%1.3%
September 20256190.2%8.2%0.0%
October 20256191.8%6.6%0.0%
November 20255978.0%10.2%1.7%
December 20253265.6%18.8%0.0%
January 20263180.6%9.7%3.2%
February 20262889.3%3.6%0.0%
March 20263183.9%12.9%0.0%
April 20263296.9%3.1%0.0%
May 20265676.8%12.5%0.0%
June 20268481.0%7.1%2.4%

What drove PWM to ATL delay minutes?

Airline was the largest recorded PWM-to-ATL delay category, accounting for 64.9% of 9,040 BTS-attributed delay minutes during July 2025–June 2026.

Airline64.9%
Late aircraft14.2%
National airspace15.8%
Weather5.0%
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.