Route on-time record
LAX to STL: most on-time flights and the best time to fly
Los Angeles (Los Angeles International Airport) to St Louis (St. Louis Lambert International Airport). 1,030 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 2903 at 5:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAX → STL
Los Angeles to St Louis: 1,030 nonstop flights a year
On time (12 months)
78%
Cancelled
0.5%
avg delay 13 min
Best time to leave
Before 9 AM
93% on time vs 66% noon to 3 PM
Most reliable airline
Southwest
77% chance on time
Lowest nonstop fare seen in the next two months: $304 (American 5000 on 2026-10-24). 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 · Southwest 2903
5:00 AM → 10:35 AM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
86%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 82% of the time (22 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; Noon to 3 PM: 66%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Limited track record · 22 flights
Find Southwest 2903 fares Opens this date on Aviasales#2 · SkyWest 5000 · sold as United Express, Delta Connection, American Eagle or Alaska
6:16 PM → 11:56 PM3h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 6215; its record covers all of them.
77%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.6%
- Avg arrival delay
- 14 min
- Arrived on time 77% of the time (173 flights, Jun 2025 to May 2026).
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 173 flights
Find 6:16 PM flight fares Opens this date on Aviasales#3 · Southwest 2904
1:20 PM → 6:55 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-30.
70%
chance on time
- On time (history)
- 72%
- Cancelled
- 0.0%
- Avg arrival delay
- 19 min
- Arrived on time 72% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Leaves in this route's least on-time window (Noon to 3 PM: 66% on time; Before 9 AM: 93%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Limited track record · 47 flights
Find Southwest 2904 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines77%
676 flights · 78% on time as flown · 0.5% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)77%
350 flights · 77% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM93%
294 flights · avg delay 4 min
- 9 AM to noon74%
81 flights · avg delay 11 min
- Noon to 3 PM66%
145 flights · avg delay 20 min
- 3 to 6 PM73%
185 flights · avg delay 14 min
- 6 to 9 PM72%
325 flights · avg delay 19 min
Best day: Tuesday (81%). Worst: Sunday (76%).
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
- Late-arriving aircraft49%
- Airline (crew, maintenance, boarding)40%
- Air traffic control and airport volume10%
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
LAX to STL questions
- What time of day is best to fly LAX to STL?
- Before 9 AM: 93% of flights arrived on time, against 66% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from LAX to STL?
- Southwest, with a season-adjusted 77% chance of operating and arriving on time over 676 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 LAX to STL?
- June (73% on time); the best was October (85%), 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 LAX
- STL to LAX (return)
- LAX to SFO 68%
- LAX to JFK 79%
- LAX to LAS 77%
- LAX to DEN 82%
- LAX to PHX 81%
- LAX to SEA 85%
- LAX to ORD 77%
- LAX to DFW 75%
- LAX to SMF 85%
- LAX to HNL 77%
- LAX to IAH 84%
- LAX to ATL 76%
Most on-time flights from LAX on every route →
Live status: FAA delays and ground stops