Historical on-time performance
Baltimore to Portland
452 miData through May 2026Source: US DOT · BTS
Flights on BWI–PWM arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 1,342 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time77%Medianon timep9030 minCancel1.3%Flights1,342
Why flights run late
Delay causes
- Airline31%
- Weather7%
- Air traffic (NAS)11%
- Late aircraft51%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline18%
- Weather65%
- Air traffic (NAS)18%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 17 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 BWI → PWM
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 — 88% on time.
- Mornings88% on time · p90 15 min · 540 flights
- Middays84% on time · p90 20 min · 1,327 flights
- Afternoons73% on time · p90 35 min · 793 flights
- Evenings63% on time · p90 55 min · 166 flights · limited
- Overnights60% on time · p90 55 min · 1,085 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 80% on time.
- Wednesdays80% on time · p90 30 min · 548 flights
- Tuesdays79% on time · p90 30 min · 551 flights
- Saturdays75% on time · p90 35 min · 540 flights
- Thursdays74% on time · p90 35 min · 572 flights
- Fridays74% on time · p90 40 min · 582 flights
- Mondays73% on time · p90 35 min · 569 flights
- Sundays66% on time · p90 40 min · 549 flights
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