Route on-time record
STL to SLC: most on-time flights and the best time to fly
St Louis (St. Louis Lambert International Airport) to Salt Lake City (Salt Lake City International Airport). 989 nonstop flights in Jun 2025 to May 2026, 88% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was Delta 2363 at 7:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
STL → SLC
St Louis to Salt Lake City: 989 nonstop flights a year
On time (12 months)
88%
Cancelled
1.0%
avg delay 12 min
Best time to leave
3 to 6 PM
91% on time vs 85% 6 to 9 PM
Most reliable airline
Delta
87% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Delta 2363
7:15 AM → 9:37 AM3h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.5%
- Avg arrival delay
- 12 min
- Arrived on time 91% of the time (362 flights, Jun 2025 to May 2026).
Strong track record · 362 flights
Find Delta 2363 fares Opens this date on Aviasales#2 · Delta 2455
2:20 PM → 4:40 PM3h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.4%
- Avg arrival delay
- 8 min
- Arrived on time 89% of the time (255 flights, Jun 2025 to May 2026).
Strong track record · 255 flights
Find Delta 2455 fares Opens this date on Aviasales#3 · Delta 2421
7:59 PM → 10:14 PM3h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 90% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 85% on time; 3 to 6 PM: 91%).
Limited track record · 20 flights
Find Delta 2421 fares Opens this date on Aviasales#4 · Delta 1492
6:12 PM → 8:25 PM3h 13m nonstop
Local times, typical schedule. Last flown 2026-05-30.
84%
chance on time
- On time (history)
- 85%
- Cancelled
- 2.0%
- Avg arrival delay
- 16 min
- Arrived on time 85% of the time (295 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 85% on time; 3 to 6 PM: 91%).
Strong track record · 295 flights
Find Delta 1492 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines87%
978 flights · 88% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
365 flights · avg delay 12 min
- Noon to 3 PM87%
302 flights · avg delay 13 min
- 3 to 6 PM91%
70 flights · avg delay 19 min
- 6 to 9 PM85%
252 flights · avg delay 10 min
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)55%
- Late-arriving aircraft28%
- Severe weather10%
- Air traffic control and airport volume7%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
STL to SLC questions
- What time of day is best to fly STL to SLC?
- 3 to 6 PM: 91% of flights arrived on time, against 85% for departures 6 to 9 PM.
- Which airline is most on time from STL to SLC?
- Delta, with a season-adjusted 87% chance of operating and arriving on time over 978 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on STL to SLC?
- February (84% on time); the best was November (93%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from STL
- SLC to STL (return)
- STL to ATL 85%
- STL to DEN 75%
- STL to ORD 71%
- STL to LGA 75%
- STL to MCO 78%
- STL to DCA 73%
- STL to DFW 74%
- STL to PHX 76%
- STL to LAS 79%
- STL to DAL 77%
- STL to DTW 83%
- STL to MSP 80%
Most on-time flights from STL on every route →
Live status: FAA delays and ground stops