Route · STL → SLC · 2020–2025 BTS data
St. Louis to Salt Lake City
The STL–SLC corridor (St. Louis, MO → Salt Lake City, UT) runs ahead of the national average, served by 13 carriers across roughly 1,156 miles.
Data updated 2026-06-13
- 89%
- On-time
- +10 pts
- vs US avg
- 89 min
- Delay when late
- 6,304
- Flights
Cancelled
0.6%
Best Month
Nov 2024 98%
Worst Month
Jul 2024 78%
Distance
1,156 mi
Carriers
13
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 79 | 17 | 1 | 0 | DL |
| Nov 2025 | 83 | 10 | 0 | 0 | DL |
| Oct 2025 | 88 | 9 | 0 | 1 | DL |
| Sep 2025 | 82 | 7 | 1 | 0 | DL |
| Aug 2025 | 88 | 10 | 1 | 0 | OO,WN,DL |
| Jul 2025 | 92 | 8 | 0 | 1 | WN,DL |
| Jun 2025 | 90 | 10 | 2 | 1 | DL,WN |
| May 2025 | 86 | 10 | 0 | 0 | DL |
| Apr 2025 | 76 | 9 | 0 | 1 | DL |
| Mar 2025 | 80 | 5 | 1 | 0 | DL |
| Feb 2025 | 65 | 7 | 0 | 0 | DL |
| Jan 2025 | 66 | 5 | 2 | 0 | DL |
| Dec 2024 | 73 | 7 | 0 | 0 | DL |
| Nov 2024 | 82 | 2 | 0 | 0 | DL |
| Oct 2024 | 84 | 5 | 0 | 0 | DL |
| Sep 2024 | 81 | 4 | 0 | 0 | DL |
| Aug 2024 | 86 | 10 | 0 | 0 | DL,WN |
| Jul 2024 | 91 | 20 | 3 | 0 | DL,WN |
| Jun 2024 | 87 | 9 | 0 | 0 | DL,WN |
| May 2024 | 79 | 7 | 0 | 0 | DL |
| Apr 2024 | 77 | 13 | 0 | 0 | DL |
| Mar 2024 | 80 | 9 | 0 | 0 | DL |
| Feb 2024 | 66 | 9 | 0 | 0 | DL |
| Jan 2024 | 69 | 11 | 1 | 0 | DL |
Cancellation Rate
0.6%
12 of 1,930 flights
Diversion Rate
0.2%
4 of 1,930 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Origin airport →SLC - Salt Lake City
Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.
Destination airport →Compare the two airports
See STL and SLC side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–SLC.
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What the Data Says About STL to SLC
St. Louis to Salt Lake City (STL to SLC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 89% on-time rate across 6,304 flights, with delays that do happen averaging 89.3 minutes. The corridor runs roughly 1,156 miles and is served by 13 carriers. Over the most recent 24 months, 12 of 1,930 flights were cancelled (0.6%) and 4 diverted (0.2%).
The monthly split is wide on this route: Nov 2024 posted the strongest performance at 98% on-time, while Jul 2024 came in at just 78% - a 20-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.