Juthamas Siriwan, 69, accepted the bribes while she was tourism chief in the early 2000s, according to the verdict delivered at a new Bangkok court handling corruption cases.
Judges also sentenced her daughter, Jittisopha, to 44 years for helping hide the cash in overseas bank accounts, and ordered Thai authorities to seize the money.
"They colluded to avoid free competition in favour of Gerald Green and Patricia Green," the court verdict said, referring to the Los Angeles-based couple behind the bribery.
The contracts enabled the couple to generate more than USD 13.5 million in revenue, according to an FBI statement about the investigation.
Official graft is endemic in Thailand and bribery is common for everything from avoiding police fines to securing school places.
The military junta that came to power in a 2014 coup has vowed to root out corruption, which has often served as a catalyst for political unrest.
Thailand's anti-corruption agency announced this month that it was investigating former senior government officials and employees of the flagship airline over allegations they took huge bribes from Rolls-Royce more than a decade ago.
The investigation was launched after the UK's Serious Fraud Office announced revelations from its own probe into the engine-maker.
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