St. Louis (STL) to Salt Lake City (SLC): On-Time Performance
Data through May 2026
When you fly STL to SLC matters as much as anything else about the booking: the route swung from 98% on-time in November 2024 to just 77% in February 2026. Across the full period the route averages 89% on-time against a national 78%.
- On-time
- 89%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 2.7
- last 12 months
- Duration
- 3h 16m
- scheduled
- Distance
- 1,156 mi
Monthly on-time trend
Best time to fly from STL to SLC
Aim for departures around 7 a.m. (93% on-time); avoid 7 p.m. departures (82%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 87% | 11 min |
| Tuesdaybest | 93% | 7 min |
| Wednesday | 90% | 7 min |
| Thursday | 92% | 12 min |
| Friday | 88% | 7 min |
| Saturday | 85% | 20 min |
| Sunday | 87% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft32%
- Airline operations54%
- National airspace system7%
- Weather8%
Frequently asked questions
- How often are flights from STL to SLC delayed?
- 11% of STL–SLC flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 11 minutes.
- What is the best time of day to fly from STL to SLC?
- Departures around 7 a.m. have the best record (93% on-time), while departures around 7 p.m. have the worst (82%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to SLC?
- The scheduled STL–SLC flight time averages 3h 16m over 1,156 miles. Actual arrival times vary — flights on this route land 15+ minutes late 11% of the time.
- How often are STL to SLC flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from STL to SLC?
- February 2026 was the roughest month in this dataset, with only 77% of arrivals on time. The best was November 2024 at 98%. If your dates are flexible, that 21-point gap is worth planning around.
Explore related pages
More routes from STL
Based on 1,946 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.