Historical on-time performance
San Diego to Seattle
1,050 miData through May 2026Source: US DOT · BTS
Flights on SAN–SEA arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled1.7%of scheduled flights
based on 4,545 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time86%Medianon timep9020 minCancel1.0%Flights1,698
- Alaska AirlinesOn-time75%Medianon timep9035 minCancel2.2%Flights2,786
- Southwest AirlinesOn-time62%Median10 minp9040 minCancel0.0%Flights61
Why flights run late
Delay causes
- Airline30%
- Weather1%
- Air traffic (NAS)17%
- Late aircraft52%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline68%
- Weather26%
- Air traffic (NAS)6%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 77 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 → SEA
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 — 85% on time.
- Mornings85% on time · p90 20 min · 3,734 flights
- Middays82% on time · p90 30 min · 4,196 flights
- Afternoons81% on time · p90 30 min · 2,622 flights
- Evenings75% on time · p90 40 min · 2,581 flights
- Overnights72% on time · p90 40 min · 697 flights
Best day of week
Tuesdays are the most reliable day to fly this route — 86% on time.
- Tuesdays86% on time · p90 20 min · 1,908 flights
- Wednesdays83% on time · p90 25 min · 1,883 flights
- Saturdays83% on time · p90 25 min · 1,669 flights
- Mondays80% on time · p90 30 min · 2,107 flights
- Thursdays80% on time · p90 35 min · 2,107 flights
- Sundays78% on time · p90 35 min · 2,074 flights
- Fridays77% on time · p90 40 min · 2,082 flights
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