WN4403Southwest Airlines · STL → SAN
live · 26m ago
Route confirmed Southwest Airlines

WN4403 St LouisSTL · 08:30 San DiegoSAN · 10:25

WN4403 by Southwest Airlines flies from St Louis (STL) to San Diego (SAN) for the Tue, Nov 3 departure.

Right nowEn route to San Diego · off blocks 08:47 · 17 min late
En route

en route from STL to SAN

En routeWN4403 · position estimated
STLSt LouisSANSan Diego
Estimated from the boards

Board estimate · gate and arrival times. Off blocks 08:47 · typical taxi-out at STL ≈ 4.9 min. No receiver coverage over open ocean.

Typical gate push+17 minmedian posted departure
Typical arrival−5 minmedian over 7 operations
Wins back in air~22 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
11-03
+17 gate · −9 arrival
10-30
+17 gate · −3 arrival
10-29
+19 gate · −5 arrival
10-28
+20 gate · +1 arrival
10-27
+17 gate · −9 arrival
10-26
+23 gate · −1 arrival
10-23
+16 gate · −7 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The last 30 days

arrival outcome per operation

median arrival −5 min · 0 cancelled · 7 operations tracked

The route today

live boards
STLSt LouisOn-time likelySTL delay board →
SANSan DiegoOn-time likelySAN delay board →
STL→SANevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
56%Chance of 15+ min delay
0.6%Chance of cancellation
+18 minTypical airport delay in this weather

Driven mainly by SAN (San Diego), currently flying VFR (visual). 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 St Louis

Forecast

Wed 4 Nov, local date

High17°Clikely 15°C to 19°C
Low13°Clikely 11°C to 15°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 San Diego

Forecast

Wed 4 Nov, local date

High23°Clikely 22°C to 24°C
Low16°Clikely 15°C to 18°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 San Diego flights today

same route · Southwest Airlines
WN1733departs 08:25
WN3661departs 08:30
WN4452departs 08:30
WN2737departs 10:00
WN8009departs 12:10

If WN4403 is cancelled, these are the other Southwest Airlines nonstop flights from St Louis to San Diego 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 WN4403 actually runs

Pro Flight Search has tracked every published board update for WN4403 across the STL and SAN boards: schedule changes, gate pushes and actual clocks. Usually lands ~6 min early. Based on 6 confirmed landings · 6/6 within 15 min of schedule. Pushes back late but makes up time in the air.

The verdict above is that record speaking, so it reflects how WN4403 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
11-03STL 08:30 08:47 (+17)SAN 10:25 10:16 (−9)
10-30STL 08:30 08:47 (+17)SAN 10:25 10:22 (−3)
10-29STL 08:30 08:49 (+19)SAN 10:25 10:20 (−5)
10-28STL 08:30 08:50 (+20)SAN 10:25 10:26 (+1)
10-27STL 08:30 08:47 (+17)SAN 10:25 10:16 (−9)
10-26STL 08:30 08:53 (+23)SAN 10:25 10:24 (−1)
10-23STL 08:30 08:46 (+16)SAN 10:25 10:18 (−7)

Aircraft

Recent tails: N8567Z, N8543Z, N8668A, N8988S.

Board clocks recorded as STL and SAN published them.

Planning around WN4403? 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: WN4403 St Louis to San Diego on-time performance, measured from the STL and SAN airport boards.

Canonical URL
https://proflightsearch.com/flight/WN4403
How we measure this →