SLC to STL flight delays & on-time performance
Nonstop flights from Salt Lake City International Airport to St. Louis Lambert International Airport · 1,156 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SLC or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Salt Lake City (SLC) to St. Louis (STL) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.6% were cancelled, and 6% arrived an hour or more late.
- Departures scheduled around 9am did best (91% on time); around 8pm did worst (78%).
- Wednesday was the most reliable day to fly (91% on time) and Sunday the least (76%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (65%).
Which airline is most on time from SLC to STL?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 100% | 0.0% | 3 min | 0.0% | 2 |
| Southwest Airlines | 89% | 0.0% | 8 min | 0.0% | 9 |
| Delta Air Lines | 84% | 0.6% | 10 min | 5.7% | 979 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 9am91%342 flights
- 10am84%19 flights
- 1pm84%65 flights
- 2pm85%79 flights
- 3pm79%108 flights
- 5pm84%95 flights
- 8pm78%260 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday84%0.0% cancelled
- Tuesday88%0.0% cancelled
- Wednesday91%0.0% cancelled
- Thursday83%0.7% cancelled
- Friday84%0.0% cancelled
- Saturday85%0.9% cancelled
- Sunday76%2.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)65%
- Late-arriving aircraft25%
- Air traffic control & airport congestion9%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)67%
- Extreme weather33%
- Air traffic control & airport congestion0%
- Security0%
SLC to STL: common questions
- How often are SLC to STL flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Salt Lake City to St. Louis cancelled?
- 0.6% of scheduled flights were cancelled (6 of 990).
- How long are typical delays?
- Across all flights the average arrival delay was 10 min (early arrivals count as zero). Flights that were late arrived 62 min behind schedule on average, and 5.6% of flights were an hour or more late.
- How long is taxi time at SLC?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to SLC — 87% on time
More flights from Salt Lake City
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SLC → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.