Historical on-time performance
San Diego to Boston
2,588 miData through Dec 2025Source: US DOT · BTS
Flights on SAN–BOS 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)
Cancelled1.1%of scheduled flights
based on 1,555 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.
- Delta Air LinesOn-time75%Medianon timep9030 minCancel1.3%Flights307
- Alaska AirlinesOn-time71%Medianon timep9065 minCancel1.5%Flights388
- JetBlue AirwaysOn-time79%Medianon timep9055 minCancel0.8%Flights860
Why flights run late
Delay causes
- Airline26%
- Weather7%
- Air traffic (NAS)38%
- Late aircraft29%
- 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 SAN → BOS
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Overnights are the most reliable time of day to fly this route — 80% on time.
- Overnights80% on time · p90 30 min · 2,329 flights
- Afternoons70% on time · p90 55 min · 157 flights · limited
- Mornings70% on time · p90 60 min · 947 flights
- Middays65% on time · p90 65 min · 1,305 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 78% on time.
- Tuesdays78% on time · p90 40 min · 672 flights
- Wednesdays77% on time · p90 40 min · 692 flights
- Saturdays76% on time · p90 40 min · 580 flights
- Mondays73% on time · p90 50 min · 708 flights
- Fridays72% on time · p90 60 min · 703 flights
- Thursdays70% on time · p90 55 min · 689 flights
- Sundays69% on time · p90 60 min · 702 flights
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