Historical on-time performance
St. Louis to Denver
Flights on STL–DEN arrive on time 74% of the time over the last 12 months.
based on 3,413 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.
- Frontier AirlinesOn-time87%Medianon timep9020 minCancel1.1%Flights91
- SkyWest AirlinesOn-time85%Medianon timep9020 minCancel0.0%Flights122
- United AirlinesOn-time74%Medianon timep9065 minCancel0.4%Flights1,041
- Southwest AirlinesOn-time74%Medianon timep9055 minCancel0.2%Flights2,159
Why flights run late
Delay causes
- Airline23%
- Weather4%
- Air traffic (NAS)36%
- Late aircraft37%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline70%
- Weather20%
- Air traffic (NAS)10%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 10 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 STL → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 3,822 flights
- Middays83% on time · p90 25 min · 2,603 flights
- Overnights69% on time · p90 60 min · 1,143 flights
- Afternoons66% on time · p90 80 min · 2,331 flights
- Evenings60% on time · p90 90 min · 1,625 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 79% on time.
- Wednesdays79% on time · p90 40 min · 1,659 flights
- Tuesdays79% on time · p90 40 min · 1,590 flights
- Thursdays77% on time · p90 40 min · 1,679 flights
- Saturdays76% on time · p90 50 min · 1,427 flights
- Mondays75% on time · p90 50 min · 1,730 flights
- Fridays75% on time · p90 55 min · 1,751 flights
- Sundays75% on time · p90 45 min · 1,688 flights
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