WN4579Southwest Airlines · SFO → MDW
live · 5m ago
Route confirmed Southwest Airlines

WN4579 San FranciscoSFO · 05:35 ChicagoMDW · 11:45

WN4579 by Southwest Airlines flies from San Francisco (SFO) to Chicago (MDW).

Right nowNext departure tomorrow Operates daily
05:35

scheduled from SFO

Typical gate push+0 minmedian posted departure
Typical arrival−14 minmedian over 5 operations
Wins back in air~14 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 5 operations · gate push → arrival
0+30+60+90 min
10-12
+17 gate · −31 arrival
10-09
+33 gate · +45 arrival
10-08
−2 gate · −14 arrival
10-05
+0 gate · −21 arrival
10-02
−1 gate · −8 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 −14 min · 0 cancelled · 5 operations tracked

The route today

live boards
SFOSan FranciscoOn-time likelySFO delay board →
MDWChicagoOn-time likelyMDW delay board →
SFO→MDWevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
53%Chance of 15+ min delay
3.0%Chance of cancellation
+17 minAvg hub delay right now

Driven mainly by SFO (San Francisco), currently flying VFR (visual). 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 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 Chicago flights today

same route · Southwest Airlines
WN2854departs 09:05
WN3448departs 09:55
WN3782departs 23:40

If WN4579 is cancelled, these are the other Southwest Airlines nonstop flights from San Francisco to Chicago on the same day, with scheduled departure times in SFO local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →

How WN4579 actually runs

Pro Flight Search has tracked every published board update for WN4579 across the SFO and MDW boards: schedule changes, gate pushes and actual clocks. Usually lands ~14 min early. Based on 5 confirmed landings · 4/5 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 WN4579 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
10-12SFO 05:35 05:52 (+17)MDW 11:45 11:14 (−31)
10-09SFO 05:35 06:08 (+33)MDW 11:45 12:30 (+45)
10-08SFO 05:35 05:33 (−2)MDW 11:45 11:31 (−14)
10-05SFO 05:35 (+0)MDW 11:45 11:24 (−21)
10-02SFO 05:35 05:34 (−1)MDW 11:45 11:37 (−8)

Aircraft

Recent tails: N8950L.

Board clocks recorded as SFO and MDW published them.

Planning around WN4579? 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 — WN4579 San Francisco to Chicago on-time performance, measured from the SFO and MDW airport boards.

Canonical URL
https://proflightsearch.com/flight/WN4579
How we measure this →