Historical on-time performance
Portland to Atlanta
1,027 miData through May 2026Source: US DOT · BTS
Flights on PWM–ATL arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 613 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesOn-time77%Medianon timep9045 minCancel1.1%Flights613
Why flights run late
Delay causes
- Airline67%
- Weather4%
- Air traffic (NAS)13%
- Late aircraft16%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline29%
- Weather71%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 7 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PWM → ATL
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 15 min · 1,096 flights
- Middays70% on time · p90 60 min · 360 flights
- Afternoons62% on time · p90 65 min · 167 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 85% on time.
- Wednesdays85% on time · p90 25 min · 239 flights
- Fridays83% on time · p90 35 min · 241 flights
- Thursdays80% on time · p90 25 min · 241 flights
- Tuesdays79% on time · p90 40 min · 238 flights
- Saturdays77% on time · p90 60 min · 255 flights
- Sundays75% on time · p90 45 min · 242 flights
- Mondays74% on time · p90 35 min · 239 flights
Keep exploring