The flight attendants were on Southwest Flight 1489 from Albuquerque to Oakland, which landed about 8:35 p.m. Thursday, an airline spokesman said, KTVU-TV, San Jose, reported.
A third flight attendant was injured but did not require hospitalization.
A passenger said the turbulence lasted about 10 seconds.
"It was bad. The plane shook a bit and then it dropped. ... You know the kind you are glad you had your seat belt on," a passenger said.
He said the turbulence was so severe, some passengers cried.
KTVU said none of the 95 passengers on the plane was hurt.