Schedule: a typical Tuesday (the flights of Jul 28, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.

UNITED · FLIGHT UA 643 SCHEDULED · TYPICAL SCHEDULE

Tuesday, September 29 Today

UA 643 · LAS → SFO

departs 6:00 AM PT · arrives 7:35 AM PT

Forecast issued Tue 10:00 PM ET · 13h after departure

UA 643 isn’t flying LAS → SFO today

This listing came from a typical schedule. According to the FAA, UA 643 flies these legs today:

SNA → IAH · 3:22 PM · landed
SNA → IAH · 3:27 PM · scheduled
SFO → SNA · 10:28 AM · landed
SFO → SNA · 10:43 AM · scheduled
SNA → IAH · 3:19 PM · landed
SNA → IAH · 3:26 PM · scheduled