We've learned the "24" star and members of the show's crew popped into The Spot in San Pedro, California last week after wrapping up a shoot nearby -- and they were ready to get their drink on.
According to an employee at the bar, Kiefer was throwing back scotch & Cokes and bought drinks for everybody in the joint -- roughly 30 people. The total damage: $500. No food ... all booze.
The drinks may have been stiff, but Kiefer wasn't -- we're told he tipped $200.
FYI: We're told Sutherland -- who has a few DUIs under his belt -- was responsible this time and used a designated driver when he left the bar.