Historical on-time performance
Baltimore to Portland
452 miData through Dec 2025Source: US DOT · BTS
Flights on BWI–PWM arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 1,341 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time78%Medianon timep9030 minCancel0.7%Flights1,341
Why flights run late
Delay causes
- Airline30%
- Weather7%
- Air traffic (NAS)13%
- Late aircraft49%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
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 · 526 flights
- Middays84% on time · p90 20 min · 1,240 flights
- Afternoons72% on time · p90 35 min · 841 flights
- Evenings63% on time · p90 55 min · 166 flights · limited
- Overnights58% 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 79% on time.
- Wednesdays79% on time · p90 35 min · 551 flights
- Tuesdays79% on time · p90 30 min · 554 flights
- Thursdays75% on time · p90 35 min · 554 flights
- Saturdays73% on time · p90 35 min · 533 flights
- Mondays72% on time · p90 35 min · 558 flights
- Fridays72% on time · p90 40 min · 562 flights
- Sundays66% on time · p90 35 min · 546 flights
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