"I was on another flight from Korea at the exact same time," USA Today quoted Sandberg as tweeting.
"We are ok. My friend on that flight is ok, too."
Sandberg said colleagues Debbie Frost, Charlton Gholson and Kelly Hoffman also switched flights.
Sandberg author of the recently released best seller "Lean In", took another flight from Seoul to cash in air miles tickets for family members, according to USA Today.
She said the United flight landed 20 minutes before the Asiana crashed.
"Thanks you to everyone who is reaching out - and sorry if we worried anyone," she tweeted.