There are
2,537 mi
from Newport Beach, CA to Niagara Falls, NY
That's the driving distance. It would take 1 day 21 hours to go from Newport Beach, California to Niagara Falls, New York.
The flight distance (direct flight from Newport Beach, CA to Niagara Falls, NY) is 2,184.57 mi.
2,537 mi = 4,083.06 kms