WN4043Southwest Airlines · SFO → LAS
live · 10m ago
Route confirmed Southwest Airlines

WN4043 San FranciscoSFO · 10:45 Las VegasLAS · 12:20

WN4043 by Southwest Airlines flies from San Francisco (SFO) to Las Vegas (LAS).

Right nowNext departure today Operates daily
10:55

scheduled from SFO

The route today

live boards
SFOSan FranciscoOn-time likelySFO delay board →
LASLas VegasHigh riskLAS delay board →
SFO→LASevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
47%Chance of 15+ min delay
0.8%Chance of cancellation
+11 minTypical airport delay in this weather

Conditions at SFO and LAS 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 San Francisco

Forecast

Wed 4 Nov, local date

High19°Clikely 18°C to 20°C
Low13°Clikely 11°C to 14°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 Las Vegas

Forecast

Wed 4 Nov, local date

High21°Clikely 19°C to 22°C
Low11°Clikely 10°C to 13°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 San Francisco to Las Vegas flights today

same route · Southwest Airlines
WN8516departs 00:25
WN4314departs 05:00
WN2821departs 05:10
WN582departs 10:10
WN365departs 13:25
WN2874departs 14:25

If WN4043 is cancelled, these are the other Southwest Airlines nonstop flights from San Francisco to Las Vegas on the same day, with scheduled departure times in SFO 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 WN4043 actually runs

Pro Flight Search has tracked every published board update for WN4043 across the SFO and LAS boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 1 completed leg so far: departed +3 min. Not enough to call it.

The verdict above is that record speaking, so it reflects how WN4043 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocks

Board log

scheduled → actual, per operation
10-30SFO 10:45 10:48 (+3)LAS 12:20 12:46 (+26)

Board clocks recorded as SFO and LAS published them.

Planning around WN4043? 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: WN4043 San Francisco to Las Vegas on-time performance, measured from the SFO and LAS airport boards.

Canonical URL
https://proflightsearch.com/flight/WN4043
How we measure this →