Historical on-time performance
Portland to Boston
2,537 miData through Dec 2025Source: US DOT · BTS
Flights on PDX–BOS arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 552 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesbestOn-time78%Medianon timep9025 minCancel0.2%Flights429
- JetBlue AirwaysOn-time58%Median5 minp9080 minCancel0.8%Flights123
Why flights run late
Delay causes
- Airline30%
- Weather0%
- Air traffic (NAS)36%
- Late aircraft34%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PDX → BOS
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 — 81% on time.
- Mornings81% on time · p90 30 min · 740 flights
- Middays71% on time · p90 60 min · 382 flights
- Overnights69% on time · p90 60 min · 706 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 77% on time.
- Sundays77% on time · p90 45 min · 291 flights
- Wednesdays76% on time · p90 40 min · 262 flights
- Saturdays75% on time · p90 35 min · 212 flights
- Tuesdays74% on time · p90 45 min · 235 flights
- Mondays74% on time · p90 45 min · 290 flights
- Fridays71% on time · p90 75 min · 292 flights
- Thursdays70% on time · p90 50 min · 289 flights
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