Historical on-time performance
Boston to Portland
2,537 miData through Dec 2025Source: US DOT · BTS
Flights on BOS–PDX arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 551 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesbestOn-time80%Medianon timep9035 minCancel0.9%Flights428
- JetBlue AirwaysOn-time64%Medianon timep9085 minCancel0.8%Flights123
Why flights run late
Delay causes
- Airline26%
- Weather1%
- Air traffic (NAS)21%
- Late aircraft51%
- 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 BOS → PDX
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 69% to 86% on time.
- Mornings86% on time · p90 20 min · 504 flights
- Afternoons76% on time · p90 35 min · 54 flights · limited
- Evenings69% on time · p90 65 min · 1,240 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 80% on time.
- Wednesdays80% on time · p90 35 min · 255 flights
- Tuesdays80% on time · p90 35 min · 256 flights
- Saturdays80% on time · p90 30 min · 230 flights
- Mondays73% on time · p90 55 min · 291 flights
- Sundays71% on time · p90 55 min · 273 flights
- Fridays70% on time · p90 65 min · 293 flights
- Thursdays67% on time · p90 75 min · 271 flights
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