WN4840 ChicagoMDW · 20:50 PortlandPDX · 23:05
WN4840 by Southwest Airlines flies from Chicago (MDW) to Portland (PDX) for the Fri, Aug 21 departure.
arrival expected at PDX · 4 min late
board checked 5m ago · checking again in 45s
⚖ WN4840 typically leaves +37 and lands +27. The air wins minutes back.Where the minutes go
last 7 operations · gate push → arrivalThe 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 operationmedian arrival +27 min · 0 cancelled · 9 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at MDW and PDX 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 Chicago to Portland flights today
same route · Southwest AirlinesIf WN4840 is cancelled, these are the other Southwest Airlines nonstop flights from Chicago to Portland on the same day, with scheduled departure times in MDW local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How WN4840 actually runs
Pro Flight Search has tracked every published board update for WN4840 across the MDW and PDX boards: schedule changes, gate pushes and actual clocks. Usually lands ~20 min late. Based on 4 confirmed landings · 2/4 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 WN4840 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: N8701Q, N8742M, N8507C, N8821S.
Board clocks recorded as MDW and PDX published them.
Planning around WN4840? 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 — WN4840 Chicago to Portland on-time performance, measured from the MDW and PDX airport boards.
https://proflightsearch.com/flight/WN4840
.