Historical on-time performance
St. Louis to Salt Lake City
1,156 miData through Dec 2025Source: US DOT · BTS
Flights on STL–SLC arrive on time 88% of the time over the last 12 months.
On-time rate88%arrived within 15 min
p90 delay15 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 964 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesOn-time88%Medianon timep9015 minCancel0.8%Flights964
Why flights run late
Delay causes
- Airline33%
- Weather20%
- Air traffic (NAS)10%
- Late aircraft37%
- 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 STL → SLC
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 — 93% on time.
- Mornings93% on time · p90 5 min · 1,094 flights
- Afternoons88% on time · p90 15 min · 832 flights
- Evenings85% on time · p90 20 min · 928 flights
- Middays77% on time · p90 35 min · 74 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 87% to 91% on time.
- Tuesdays91% on time · p90 10 min · 404 flights
- Wednesdays90% on time · p90 10 min · 407 flights
- Thursdays89% on time · p90 10 min · 434 flights
- Saturdays89% on time · p90 15 min · 374 flights
- Mondays88% on time · p90 15 min · 445 flights
- Fridays87% on time · p90 20 min · 435 flights
- Sundays87% on time · p90 20 min · 445 flights
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