Route
STL → SLC
St. Louis Lambert International Airport Salt Lake City International Airport
1,156 miles
Return route SLC → STL →
How punctual is this route?
- On-time arrivals
- 86.8%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 108 min
- Flights arriving 15+ minutes late
- Flights tracked
- 990
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 60%
- Late-arriving aircraft 25%
- Extreme weather 8%
- Air traffic control & airport 7%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.4% | 82 |
| October 2025 | 89.7% | 88 |
| November 2025 | 88.0% | 83 |
| December 2025 | 78.2% | 79 |
| January 2026 | 91.7% | 62 |
| February 2026 | 76.9% | 65 |
| March 2026 | 88.2% | 87 |
| April 2026 | 86.0% | 86 |
| May 2026 | 95.3% | 87 |
| June 2026 | 83.3% | 90 |
| July 2026 | 89.1% | 93 |
| August 2026 | 82.8% | 88 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Delta Air Lines | 981 | 87.0% | 0.9% | 109 min |
| Southwest Airlines | 9 | 66.7% | 0.0% | 47 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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