Historical on-time performance
Boston to Philadelphia
280 miData through May 2026Source: US DOT · BTS
Flights on BOS–PHL arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled3.1%of scheduled flights
based on 4,848 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysbestOn-time76%Medianon timep9050 minCancel3.7%Flights1,747
- American AirlinesOn-time72%Medianon timep9070 minCancel3.0%Flights2,208
- JetBlue AirwaysOn-time70%Medianon timep9070 minCancel2.2%Flights893
Why flights run late
Delay causes
- Airline28%
- Weather2%
- Air traffic (NAS)16%
- Late aircraft55%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline11%
- Weather63%
- Air traffic (NAS)26%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 151 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 BOS → PHL
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 — 86% on time.
- Mornings86% on time · p90 20 min · 5,488 flights
- Middays80% on time · p90 45 min · 3,270 flights
- Afternoons70% on time · p90 60 min · 2,773 flights
- Evenings64% on time · p90 90 min · 2,715 flights
- Overnights63% on time · p90 85 min · 709 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 81% on time.
- Wednesdays81% on time · p90 40 min · 2,126 flights
- Saturdays80% on time · p90 40 min · 1,689 flights
- Tuesdays79% on time · p90 40 min · 2,150 flights
- Fridays75% on time · p90 60 min · 2,268 flights
- Thursdays75% on time · p90 60 min · 2,254 flights
- Mondays74% on time · p90 55 min · 2,269 flights
- Sundays73% on time · p90 60 min · 2,199 flights
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