WN421

STL → MDW · Boeing 737-700 · Southwest Airlines

For travellers

Arrival · Chicago (MDW)

Gate A16

Scheduled 14:00 · Landed 13:57

Board status: Active

Landed 13:57 (airport data)

Board data from mdw, updated 20 min ago; times local to each airport.

Flight

Status

Completed (landing confirmed by airport data)

Arrival confirmed via

Airport data (confirmed)

Departure

St Louis Lambert International Airport (STL) — St Louis, United States

Departed

2026-10-03 17:54 UTC

Arrival

Chicago Midway International Airport (MDW) — Chicago, United States

Scheduled arrival

2026-10-03 19:00 UTC

Estimated arrival

2026-10-03 19:00 UTC

Distance flown

450 km

Straight-line distance

404 km

Aircraft

Registration

N957WN

Type

Boeing 737-700

Seats

143 total (143 Economy)

CO2 (EMEP est., total)

10.2 t (71 kg/pax Economy)

Altitude & speed

Max altitude

27,000 ft

Max ground speed

485 kt

Tracked

1h 20m · 448 km

Altitude (ft, max 27,000)

Ground speed (kt, max 485)

Altitude (ft, max 27,000)

Ground speed (kt, max 485)

From the ADS-B positions we received; time since the first fix. A dashed stretch is a gap in reception, bridged by a straight line.

Route map

Airline

Southwest Airlines (SWA)

Latest flights

Departed	Flight	Route	Reg	Aircraft	Status	Distance
2026-10-03 17:54 UTC	SWA421	STL → MDW St Louis → Chicago	N957WN	Boeing 737-700	Completed (landing confirmed by airport data)	450 km
2026-09-30 20:34 UTC	SWA421	LAS → PIT Las Vegas → Pittsburgh	N9012J	Boeing 737 MAX 8	Completed	3146 km
2026-09-29 20:51 UTC	SWA421	LAS → PIT Las Vegas → Pittsburgh	N8839Q	Boeing 737 MAX 8	Completed	3245 km

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