Historical on-time performance
San Diego to Boston
Flights on SAN–BOS arrive on time 76% of the time over the last 12 months.
based on 1,674 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- JetBlue AirwaysOn-time78%Medianon timep9055 minCancel1.3%Flights915
- Delta Air LinesOn-time77%Medianon timep9030 minCancel1.3%Flights307
- Alaska AirlinesOn-time72%Medianon timep9055 minCancel1.8%Flights452
Why flights run late
Delay causes
- Airline27%
- Weather9%
- Air traffic (NAS)33%
- Late aircraft30%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline46%
- Weather46%
- Air traffic (NAS)8%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 24 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 SAN → BOS
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Overnights are the most reliable time of day to fly this route — 80% on time.
- Overnights80% on time · p90 35 min · 2,352 flights
- Mornings73% on time · p90 60 min · 942 flights
- Afternoons73% on time · p90 65 min · 226 flights
- Middays67% on time · p90 65 min · 1,276 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 79% on time.
- Tuesdays79% on time · p90 40 min · 677 flights
- Saturdays78% on time · p90 35 min · 571 flights
- Wednesdays77% on time · p90 40 min · 696 flights
- Mondays75% on time · p90 50 min · 716 flights
- Fridays73% on time · p90 60 min · 721 flights
- Thursdays71% on time · p90 60 min · 707 flights
- Sundays70% on time · p90 60 min · 716 flights
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