Historical on-time performance
Portland to Baltimore
452 miData through May 2026Source: US DOT · BTS
Flights on PWM–BWI arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 1,343 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time80%Medianon timep9025 minCancel0.9%Flights1,343
Why flights run late
Delay causes
- Airline30%
- Weather8%
- Air traffic (NAS)22%
- Late aircraft39%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline8%
- Weather83%
- Air traffic (NAS)8%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 12 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 → BWI
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 — 89% on time.
- Mornings89% on time · p90 15 min · 1,204 flights
- Middays80% on time · p90 25 min · 1,210 flights
- Afternoons77% on time · p90 35 min · 907 flights
- Evenings65% on time · p90 55 min · 592 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 84% on time.
- Wednesdays84% on time · p90 20 min · 548 flights
- Tuesdays82% on time · p90 30 min · 551 flights
- Thursdays81% on time · p90 25 min · 572 flights
- Saturdays80% on time · p90 25 min · 542 flights
- Mondays78% on time · p90 30 min · 569 flights
- Fridays77% on time · p90 40 min · 582 flights
- Sundays77% on time · p90 30 min · 549 flights
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