Schedule: a typical Wednesday (the flights of Jul 29, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.

SOUTHWEST · FLIGHT WN 4156 SCHEDULED · TYPICAL SCHEDULE

Wednesday, September 30 Today

WN 4156 · BOS → DEN

departs 5:00 AM ET · arrives 7:25 AM MT

Forecast issued Wed 5:00 PM ET · 12h after departure

WN 4156 isn’t flying BOS → DEN today

This listing came from a typical schedule. According to the FAA, WN 4156 flies these legs today:

SMF → PDX · 8:26 AM · landed
SMF → PDX · 8:37 AM · scheduled
PDX → DEN · 10:47 AM · landed
PDX → DEN · 10:47 AM · scheduled
SMF → PDX · 8:27 AM · scheduled
SMF → PDX · 8:33 AM · landed
PDX → DEN · 10:46 AM · scheduled
PDX → DEN · 10:47 AM · landed