Historical on-time performance
San Diego to Salt Lake City
626 miData through May 2026Source: US DOT · BTS
Flights on SAN–SLC arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 2,761 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time88%Medianon timep9015 minCancel0.6%Flights1,733
- SkyWest AirlinesOn-time78%Medianon timep9045 minCancel0.8%Flights620
- Southwest AirlinesOn-time76%Medianon timep9035 minCancel0.2%Flights408
Why flights run late
Delay causes
- Airline31%
- Weather3%
- Air traffic (NAS)11%
- Late aircraft55%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline47%
- Weather29%
- Air traffic (NAS)24%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 17 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 → SLC
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 · 2,360 flights
- Middays82% on time · p90 30 min · 2,678 flights
- Evenings82% on time · p90 35 min · 2,441 flights
- Afternoons69% on time · p90 40 min · 394 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 88% on time.
- Tuesdays88% on time · p90 15 min · 1,103 flights
- Wednesdays87% on time · p90 20 min · 1,102 flights
- Mondays86% on time · p90 20 min · 1,172 flights
- Saturdays84% on time · p90 25 min · 1,033 flights
- Sundays81% on time · p90 30 min · 1,226 flights
- Thursdays80% on time · p90 40 min · 1,151 flights
- Fridays79% on time · p90 40 min · 1,182 flights
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