WN4315 OntarioONT · 17:45 Las VegasLAS · 18:50
WN4315 by Southwest Airlines flies from Ontario (ONT) to Las Vegas (LAS) for the Thu, Sep 10 departure.
arrival expected at LAS · on schedule
board checked 60m ago · checking again in 45s
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at ONT and LAS are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, 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 →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Ontario to Las Vegas flights today
same route · Southwest AirlinesIf WN4315 is cancelled, these are the other Southwest Airlines nonstop flights from Ontario to Las Vegas on the same day, with scheduled departure times in ONT local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How WN4315 actually runs
Pro Flight Search has tracked every published board update for WN4315 across the ONT and LAS boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: departed +35 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how WN4315 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N8563Z, N8746Q.
Board clocks recorded as ONT and LAS published them.
Planning around WN4315? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — WN4315 Ontario to Las Vegas on-time performance, measured from the ONT and LAS airport boards.
https://proflightsearch.com/flight/WN4315
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