Route Reliability
St. Louis → Salt Lake City
STL–SLC · 1,156 miles · St. Louis Lambert International Airport to Salt Lake City International Airport
- 88%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 1.0%
- Cancelled
- 989
- Flights in the data
Data through May 2026.
Airlines on this route
- Delta Air Lines88% on time · 980 flights
- Southwest Airlines100% on time · 9 flights
Too little history on this route to call a winner. We rank airlines only after 100 flights each.
What the data says
The 3–6 PM departure wins.
STL–SLC flights departing between 3–6 PM arrived on time 93% of the time, versus 85% between 6–9 PM.
Saturday is the weak spot.
STL–SLC flights arrived on time 92% of the time on Tuesdays. On Saturdays: 83%.
Trending in the right direction.
STL–SLC flights arrived on time 90% of the time over the last three months in the data, compared with 82% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon86%(147 flights)
- Tue92%(144 flights)
- Wed91%(143 flights)
- Thu91%(142 flights)
- Fri90%(142 flights)
- Sat83%(113 flights)
- Sun84%(144 flights)
- 6–9 AM91%(362 flights)
- 12–3 PM87%(298 flights)
- 3–6 PM93%(68 flights)
- 6–9 PM85%(247 flights)
Jun 89% → May 95% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 89% | 87 |
| July 2025 | 91% | 91 |
| August 2025 | 91% | 87 |
| September 2025 | 93% | 81 |
| October 2025 | 90% | 87 |
| November 2025 | 88% | 83 |
| December 2025 | 78% | 78 |
| January 2026 | 92% | 60 |
| February 2026 | 77% | 65 |
| March 2026 | 88% | 85 |
| April 2026 | 86% | 86 |
| May 2026 | 95% | 85 |
Keep nerding
Based on 989 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.