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.
Exploding whale video goes viral on Internet
Wisconsin business offering 'therapeutic cuddling' forced to close