WN3556Southwest Airlines · SFO → MDW
live · 12m ago
Route confirmed Southwest Airlines

WN3556 San FranciscoSFO · 23:40 ChicagoMDW · 05:50

WN3556 by Southwest Airlines flies from San Francisco (SFO) to Chicago (MDW) for the Fri, Sep 11 departure.

Right nowLanded in Chicago · today
05:42

arrived at MDW · 8 min early

Typical gate push+7 minmedian posted departure
Typical arrival−8 minmedian over 5 operations
Wins back in air~15 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
09-11
+7 gate · −8 arrival
09-10
+7 gate · −8 arrival
09-09
+11 gate · −8 arrival
09-08
−5 gate · −18 arrival
09-07
−1 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 −8 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
57%Chance of 15+ min delay
1.6%Chance of cancellation
+23 minAvg hub delay right now

Driven mainly by SFO (San Francisco), currently flying MVFR (marginal 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
WN717departs 05:35
WN4530departs 08:00
WN2499departs 08:50
WN957departs 10:30

If WN3556 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 WN3556 actually runs

Pro Flight Search has tracked every published board update for WN3556 across the SFO and MDW boards: schedule changes, gate pushes and actual clocks. Usually lands ~8 min early. Based on 5 confirmed landings · 5/5 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 WN3556 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
09-11SFO 23:40 23:47 (+7)MDW 05:50 05:42 (−8)
09-10SFO 23:40 23:47 (+7)MDW 05:50 05:42 (−8)
09-09SFO 23:40 23:51 (+11)MDW 05:50 05:42 (−8)
09-08SFO 23:40 23:35 (−5)MDW 05:50 05:32 (−18)
09-07SFO MDW 05:55 05:54 (−1)

Board clocks recorded as SFO and MDW published them.

Planning around WN3556? 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 — WN3556 San Francisco to Chicago on-time performance, measured from the SFO and MDW airport boards.

Canonical URL
https://proflightsearch.com/flight/WN3556
How we measure this →