Route · SLC → STL · 2020–2025 BTS data
Salt Lake City to St. Louis
The SLC–STL corridor (Salt Lake City, UT → St. Louis, MO) runs ahead of the national average, served by 13 carriers across roughly 1,156 miles.
Data updated 2026-06-13
- 84.3%
- On-time
- +5.3 pts
- vs US avg
- 66 min
- Delay when late
- 6,271
- Flights
Cancelled
0.4%
Best Month
Oct 2024 93%
Worst Month
Jul 2024 71%
Distance
1,156 mi
Carriers
13
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 79 | 16 | 1 | 0 | DL |
| Nov 2025 | 83 | 14 | 0 | 0 | DL |
| Oct 2025 | 88 | 11 | 0 | 0 | DL |
| Sep 2025 | 82 | 18 | 1 | 0 | DL |
| Aug 2025 | 88 | 17 | 0 | 0 | OO,WN,DL |
| Jul 2025 | 92 | 18 | 0 | 0 | WN,DL |
| Jun 2025 | 90 | 13 | 1 | 0 | DL,WN |
| May 2025 | 86 | 15 | 0 | 0 | DL |
| Apr 2025 | 76 | 14 | 0 | 0 | DL |
| Mar 2025 | 80 | 9 | 1 | 1 | DL |
| Feb 2025 | 65 | 9 | 0 | 0 | DL |
| Jan 2025 | 66 | 15 | 1 | 1 | DL |
| Dec 2024 | 73 | 16 | 0 | 0 | DL |
| Nov 2024 | 82 | 10 | 0 | 0 | DL |
| Oct 2024 | 84 | 6 | 0 | 0 | DL |
| Sep 2024 | 81 | 7 | 0 | 0 | DL |
| Aug 2024 | 86 | 16 | 0 | 0 | DL,WN |
| Jul 2024 | 91 | 26 | 2 | 0 | DL,WN |
| Jun 2024 | 87 | 12 | 0 | 0 | DL,WN |
| May 2024 | 79 | 9 | 0 | 0 | DL |
| Apr 2024 | 77 | 18 | 0 | 0 | DL |
| Mar 2024 | 80 | 20 | 0 | 0 | DL |
| Feb 2024 | 66 | 8 | 0 | 0 | DL |
| Jan 2024 | 69 | 15 | 0 | 0 | DL |
Cancellation Rate
0.4%
7 of 1,930 flights
Diversion Rate
0.1%
2 of 1,930 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SLC - Salt Lake City
Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.
Origin airport →STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Destination airport →Compare the two airports
See SLC and STL side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SLC–STL.
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What the Data Says About SLC to STL
Bureau of Transportation Statistics records show Salt Lake City to St. Louis (SLC to STL) running a 84.3% on-time rate over 6,271 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 65.6 minutes. The 1,156-mile corridor is served by 13 carriers, and over the last 24 months 0.4% of 1,930 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 93% on-time, while Jul 2024 came in at just 71% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.