Historical on-time performance
Denver to St. Louis
770 miData through May 2026Source: US DOT · BTS
Flights on DEN–STL arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 3,423 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Frontier AirlinesOn-time92%Medianon timep90on timeCancel0.0%Flights91
- United AirlinesbestOn-time79%Medianon timep9040 minCancel0.2%Flights1,042
- Southwest AirlinesOn-time76%Medianon timep9050 minCancel0.3%Flights2,168
- SkyWest AirlinesOn-time62%Medianon timep9085 minCancel0.0%Flights122
Why flights run late
Delay causes
- Airline26%
- Weather3%
- Air traffic (NAS)13%
- Late aircraft57%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather67%
- Air traffic (NAS)33%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 9 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 DEN → STL
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 · 3,669 flights
- Middays82% on time · p90 30 min · 2,674 flights
- Afternoons69% on time · p90 45 min · 1,171 flights
- Evenings63% on time · p90 75 min · 2,484 flights
- Overnights62% on time · p90 80 min · 1,524 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.
- Tuesdays79% on time · p90 40 min · 1,589 flights
- Wednesdays78% on time · p90 35 min · 1,662 flights
- Saturdays77% on time · p90 35 min · 1,423 flights
- Mondays75% on time · p90 50 min · 1,724 flights
- Thursdays75% on time · p90 50 min · 1,674 flights
- Fridays74% on time · p90 50 min · 1,739 flights
- Sundays73% on time · p90 50 min · 1,711 flights
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