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

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

77.1% of 642 official scheduled ATL-to-PWM flights arrived on time; 13.2% 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 SIGNALGenerally reliable
77.1%arrived on time
13.2%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 late6.4%all scheduled flights
120+ minutes late2.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+7.6 mincompleted flights

Which departure time was most reliable for ATL to PWM?

Among qualifying ATL-to-PWM departure window results, Late morning had the highest on-time rate: 88.6% of 211 flights. Night was lowest at 67.1% across 85 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning21188.6%4.3%0.5%
Afternoon6968.1%15.9%2.9%
Evening27773.6%17.3%1.1%
Night8567.1%20.0%1.2%

Which weekday was most reliable for ATL to PWM?

Among qualifying ATL-to-PWM weekday results, Tuesday had the highest on-time rate: 82.8% of 93 flights. Sunday was lowest at 68.5% across 92 flights.

DayFlightsOn time30+ minCancelled
Monday9179.1%14.3%1.1%
Tuesday9382.8%8.6%1.1%
Wednesday9077.8%11.1%0.0%
Thursday9074.4%11.1%1.1%
Friday8976.4%12.4%2.2%
Saturday9780.4%14.4%1.0%
Sunday9268.5%20.7%1.1%

Which airline was most reliable for ATL to PWM?

Only Delta Air Lines met the ATL-to-PWM airline threshold: 77.1% of 642 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines64277.1%13.2%1.1%

Which month was most reliable for ATL to PWM?

Among qualifying ATL-to-PWM month results, September 2025 had the highest on-time rate: 90.2% of 61 flights. March 2026 was lowest at 54.8% across 31 flights.

MonthFlightsOn time30+ minCancelled
July 20259260.9%23.9%2.2%
August 20257582.7%9.3%1.3%
September 20256190.2%4.9%0.0%
October 20256188.5%6.6%0.0%
November 20255976.3%13.6%1.7%
December 20253256.2%31.2%0.0%
January 20263183.9%12.9%3.2%
February 20262875.0%10.7%0.0%
March 20263154.8%25.8%0.0%
April 20263287.5%6.2%0.0%
May 20265683.9%10.7%0.0%
June 20268478.6%9.5%2.4%

What drove ATL to PWM delay minutes?

Airline was the largest recorded ATL-to-PWM delay category, accounting for 44.4% of 8,162 BTS-attributed delay minutes during July 2025–June 2026.

Airline44.4%
Late aircraft32.6%
National airspace17.1%
Weather5.9%
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.