Historical on-time performance
Denver to St. Louis
770 miData through Dec 2025Source: US DOT · BTS
Flights on DEN–STL arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 3,477 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesOn-time62%Medianon timep9085 minCancel0.7%Flights152
- Southwest AirlinesOn-time74%Medianon timep9050 minCancel0.7%Flights2,159
- United AirlinesOn-time80%Medianon timep9040 minCancel0.5%Flights1,075
- Frontier AirlinesbestOn-time92%Medianon timep90on timeCancel0.0%Flights91
Why flights run late
Delay causes
- Airline28%
- Weather2%
- Air traffic (NAS)16%
- Late aircraft53%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly DEN → STL
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 15 min · 3,868 flights
- Middays81% on time · p90 30 min · 2,518 flights
- Afternoons68% on time · p90 45 min · 1,039 flights
- Overnights62% on time · p90 80 min · 1,663 flights
- Evenings62% on time · p90 75 min · 2,502 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 78% on time.
- Tuesdays78% on time · p90 40 min · 1,643 flights
- Wednesdays76% on time · p90 40 min · 1,688 flights
- Saturdays75% on time · p90 40 min · 1,423 flights
- Mondays75% on time · p90 45 min · 1,733 flights
- Thursdays74% on time · p90 50 min · 1,668 flights
- Sundays73% on time · p90 45 min · 1,718 flights
- Fridays73% on time · p90 50 min · 1,717 flights
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