Salt Lake City (SLC) to St. Louis (STL): On-Time Performance
Data through July 2026
The calendar drives reliability on SLC–STL. March 2026 flights landed on schedule 94% of the time, but July 2024 dropped to 71% — a gap of 23 points. Across the full period the route averages 84% on-time against a national 78%.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 2.7
- last 12 months
- Duration
- 2h 49m
- scheduled
- Distance
- 1,156 mi
Monthly on-time trend
Best time to fly from SLC to STL
Aim for departures around 9 a.m. (88% on-time); avoid 3 p.m. departures (79%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 86% | 10 min |
| Tuesdaybest | 89% | 8 min |
| Wednesday | 87% | 7 min |
| Thursday | 84% | 12 min |
| Friday | 80% | 13 min |
| Saturday | 82% | 12 min |
| Sunday | 78% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft25%
- Airline operations62%
- National airspace system8%
- Weather5%
Frequently asked questions
- How often are flights from SLC to STL delayed?
- 16% of SLC–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 11 minutes.
- What is the best time of day to fly from SLC to STL?
- Departures around 9 a.m. have the best record (88% on-time), while departures around 3 p.m. have the worst (79%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SLC to STL?
- The scheduled SLC–STL flight time averages 2h 49m over 1,156 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are SLC to STL flights cancelled?
- 0.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SLC to STL?
- July 2024 was the roughest month in this dataset, with only 71% of arrivals on time. The best was March 2026 at 94%. If your dates are flexible, that 23-point gap is worth planning around.
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Based on 2,042 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.