Historical on-time performance
San Diego to Denver
Flights on SAN–DEN arrive on time 78% of the time over the last 12 months.
based on 5,778 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.
- United AirlinesOn-time83%Medianon timep9030 minCancel0.8%Flights2,090
- Alaska AirlinesOn-time81%Medianon timep9035 minCancel1.3%Flights378
- SkyWest AirlinesOn-time80%Medianon timep9025 minCancel2.4%Flights205
- Frontier AirlinesOn-time78%Medianon timep9055 minCancel1.1%Flights718
- Southwest AirlinesOn-time72%Medianon timep9050 minCancel0.8%Flights2,387
Why flights run late
Delay causes
- Airline22%
- Weather2%
- Air traffic (NAS)32%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline33%
- Weather37%
- Air traffic (NAS)30%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 54 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 → DEN
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 · 5,476 flights
- Middays79% on time · p90 35 min · 4,446 flights
- Evenings75% on time · p90 50 min · 2,589 flights
- Overnights72% on time · p90 45 min · 1,066 flights
- Afternoons68% on time · p90 65 min · 3,343 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 83% on time.
- Saturdays83% on time · p90 30 min · 2,119 flights
- Tuesdays83% on time · p90 30 min · 2,261 flights
- Wednesdays81% on time · p90 35 min · 2,333 flights
- Mondays77% on time · p90 40 min · 2,549 flights
- Sundays77% on time · p90 40 min · 2,548 flights
- Thursdays75% on time · p90 50 min · 2,541 flights
- Fridays73% on time · p90 55 min · 2,569 flights
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