WN4366 ChicagoMDW · 22:20 SeattleSEA · 00:55
WN4366 by Southwest Airlines flies from Chicago (MDW) to Seattle (SEA).
scheduled from MDW
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at MDW and SEA 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 on this route
ForecastChicago to Seattle with Southwest Airlines · Fri 30 Oct, local date
- Chance a departure is cancelled
- 0.3%0.7× usual
- Chance a departure leaves 60+ min late
- 18%1.2× usual
Forecast weather: 74% chance of rain at Seattle
Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · About 1 departures a day on this route with this airline. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Chicago to Seattle flights today
same route · Southwest AirlinesIf WN4366 is cancelled, these are the other Southwest Airlines nonstop flights from Chicago to Seattle on the same day, with scheduled departure times in MDW 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 WN4366 actually runs
Pro Flight Search has tracked every published board update for WN4366 across the MDW and SEA boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 2 completed legs so far: departed +23 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how WN4366 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as MDW and SEA published them.
Planning around WN4366? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search: WN4366 Chicago to Seattle on-time performance, measured from the MDW and SEA airport boards.
https://proflightsearch.com/flight/WN4366
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