Schedule: a typical summer Monday (the flights of Jul 27, 2026), re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

SOUTHWEST · FLIGHT WN 4421 SCHEDULED · TYPICAL SCHEDULE

Monday, October 5 Tomorrow

WN 4421 · OAK → ONT

departs 6:00 AM PT · arrives 7:25 AM PT

Forecast issued Sun 10:00 AM ET · 23h before departure

WN 4421 isn’t flying OAK → ONT on Mon, Oct 5

This listing came from a typical schedule. According to the FAA, WN 4421 flies these legs that day:

DEN → BOI · 9:10 PM · scheduled