Historical on-time performance
Baltimore to Boston
369 miData through May 2026Source: US DOT · BTS
Flights on BWI–BOS arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled2.8%of scheduled flights
based on 3,566 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time78%Medianon timep9055 minCancel3.1%Flights1,083
- Southwest AirlinesOn-time70%Medianon timep9055 minCancel2.6%Flights2,381
- Spirit AirlinesOn-time60%Medianon timep90125 minCancel4.9%Flights102
Why flights run late
Delay causes
- Airline29%
- Weather3%
- Air traffic (NAS)38%
- Late aircraft30%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline17%
- Weather46%
- Air traffic (NAS)37%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 100 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 → BOS
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 — 90% on time.
- Mornings90% on time · p90 10 min · 3,174 flights
- Middays80% on time · p90 35 min · 2,221 flights
- Afternoons65% on time · p90 70 min · 2,269 flights
- Evenings61% on time · p90 85 min · 2,467 flights
- Overnights60% on time · p90 75 min · 1,713 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 78% on time.
- Wednesdays78% on time · p90 40 min · 1,685 flights
- Tuesdays77% on time · p90 45 min · 1,697 flights
- Saturdays75% on time · p90 45 min · 1,315 flights
- Thursdays72% on time · p90 60 min · 1,812 flights
- Fridays71% on time · p90 60 min · 1,834 flights
- Mondays71% on time · p90 60 min · 1,819 flights
- Sundays69% on time · p90 60 min · 1,682 flights
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