As the news spread online, people began speculating Cathay Pacific may not honour the tickets - as doing so would likely prove very costly.
Singapore Airlines, for example, honoured tickets sold for less than half price in 2014.
The company accidentally sold the premium seats for a steep discount, but the lucky few who made bookings will travel in style after the Hong Kong-based airline said it will honour the fares.
Other flights from Vietnam to United States airports were also offered at drastically reduced rates. Several bargain hunters had taken advantage of the glitch and paid as little as RM2,800 for a return business class seat from Vietnam to North America which usually costs about RM19,000.
Twitter users who said they had bought the cheap tickets lined up to welcome the news, though at least one questioned whether it was a publicity stunt - something an airline representative denied.
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While the passengers were kept happy, the mistake adds to embarrassments for the carrier, which is struggling to turn its fortunes around as competition intensifies from Chinese and budget airlines.
The pricing gaffe comes just months after a sophisticated hack on Cathay Pacific's computer systems previous year that exposed private information of 9.4 million passengers. Ticket prices weren't available for August on the website.
Pricing mistakes sometimes happen at airlines due to human or technical issues in the computer system or from currency conversion errors.
A spokesperson for Cathay declined to say how many tickets were sold at the discounted price.
In October past year, it also revealed a major data breach affecting 9.4 million passengers that leaked passport numbers, credit card numbers, and email addresses.