ATL to PWM flight delays
Atlanta, GA (ATL) Portland, ME (PWM) · 1,027 miles
642 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
77.95%
Arrived on time
Within 15 minutes of schedule
1.09%
Cancelled
Share of scheduled flights
58 min
When late, late by
Average across delayed arrivals
14 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In September it ran 35.4 points more punctual than in March — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Only Delta Air Lines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
The Atlanta to Portland route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, Delta Air Lines arrived on time most often on ATL to PWM. Flights ran closest to schedule in September and worst in March.
Every airline on ATL to PWM
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 642 | 77.95% | 1.09% | 58 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
PWM to ATL Portland back to Atlanta 81.07% on time COther routes from Atlanta
Common questions
Are flights from Atlanta to Portland usually delayed?
77.95% of flights on the ATL to PWM route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from Atlanta to Portland?
Only Delta Air Lines appears in the published record on this route, with 642 flights and 77.95% arriving on time.
How often are ATL to PWM flights cancelled?
1.09% of scheduled flights did not operate — about 11 in every thousand. That is in the normal range.
What is the best month to fly Atlanta to Portland?
September, when 90.2% of flights arrived on time. The worst was March at 54.8%.
When ATL to PWM flights are late, how late are they?
About 58 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ATL to PWM during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →