"There can be more than one winner so long as the transaction is completed at the stipulated time. Winners will be reimbursed with the exact amount paid for the flight ticket during the booking, excluding airport taxes," it said.
The ticket must be purchased only via the online booking engine at www.malaysiaairlines.com.
"The second contest, "LONDON ON US", is a trivia event that runs from Dec 12-17.
MAS said the trivia questions will be available online at www.malaysiaairlines.com.
Customers need to click on the contest banner at the homepage and it will lead them to the contest page.
MAS Senior Vice President for Malaysia/Asean, Muzammil Mohamad said the airline had journeyed around the world for 40 years now, and this would not have been possible without the support of its customers.
"In addition to the ongoing year end sales campaign which ends on Dec 17, we are also running two exciting contests with great prizes to reward our customers," he said.
"We've made it easy to win the contests and even learn a little more about MAS," he added.
More information on the two contests and the year end sales campaign is available on www.malaysiaairlines.com.
Both contests are open to Malaysian citizens but restricted for employees or immediate family members and relatives of MAS, its affiliates and subsidiaries.