WN3850Southwest Airlines · STL → LAX
updated 3h ago
Route confirmed Southwest Airlines

WN3850 St LouisSTL Los AngelesLAX

WN3850 by Southwest Airlines flies from St Louis (STL) to Los Angeles (LAX).

Right nowNext departure today Operates daily
09:50

scheduled from STL

The route today

live boards
STLSt LouisOn-time likelySTL delay board →
LAXLos AngelesOn-time likelyLAX delay board →
STL→LAXevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
41%Chance of 15+ min delay
1.1%Chance of cancellation
+8 minTypical airport delay in this weather

Conditions at STL and LAX are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at STL

Forecast

Fri 6 Nov, local date

High11°Clikely 10°C to 14°C
Low7°Clikely 5°C to 10°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at LAX

Forecast

Fri 6 Nov, local date

High27°Clikely 25°C to 29°C
Low16°Clikely 15°C to 17°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other St Louis to Los Angeles flights today

same route · Southwest Airlines
WN2543departs 05:05
WN2493departs 06:00
WN3091departs 08:30
WN4625departs 08:30
WN2261departs 08:35
WN2710departs 10:00

If WN3850 is cancelled, these are the other Southwest Airlines nonstop flights from St Louis to Los Angeles on the same day, with scheduled departure times in STL local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How WN3850 actually runs

Pro Flight Search has tracked every published board update for WN3850 across the STL and LAX boards: schedule changes, gate pushes and actual clocks. Combined risk score: 33.0/100. Based on airport operations, weather, and cached board history at STL and LAX.

The verdict above is that record speaking, so it reflects how WN3850 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Planning around WN3850? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: WN3850 St Louis to Los Angeles on-time performance, measured from the STL and LAX airport boards.

Canonical URL
https://proflightsearch.com/flight/WN3850
How we measure this →