Historical on-time performance
Salt Lake City to St. Louis
1,156 miData through Dec 2025Source: US DOT · BTS
Flights on SLC–STL arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.5%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-time82%Medianon timep9040 minCancel0.5%Flights964
Why flights run late
Delay causes
- Airline59%
- Weather5%
- Air traffic (NAS)8%
- Late aircraft28%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SLC → STL
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 78% to 86% on time.
- Mornings86% on time · p90 20 min · 1,103 flights
- Middays85% on time · p90 20 min · 369 flights
- Evenings82% on time · p90 35 min · 328 flights
- Afternoons81% on time · p90 35 min · 381 flights
- Overnights78% on time · p90 50 min · 763 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 88% on time.
- Tuesdays88% on time · p90 20 min · 404 flights
- Mondays85% on time · p90 30 min · 445 flights
- Saturdays84% on time · p90 20 min · 375 flights
- Wednesdays83% on time · p90 25 min · 407 flights
- Thursdays82% on time · p90 30 min · 434 flights
- Sundays79% on time · p90 40 min · 445 flights
- Fridays79% on time · p90 35 min · 434 flights
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