Thai Airways International was judged to be the tenth best airline.
The World Airline Awards, now in their 18th year, are based on customer satisfaction surveys.
"Singapore Airlines is honored to be named World's Best Airline in the Skytrax awards, and I dedicate it to the 26,000 SIA Group employees who focus every day on delivering the world's best travel experience to our customers", Singapore Airlines CEO Goh Choon Phong said in a statement.
Qantas dominated the awards for the Australia-Pacific region, taking out best airline, best first class, best business class, best economy class and best staff.More news: Oz Amazon Prime Day Posts Record Results
Meanwhile, the world airline awards are based on the results of a year-long, online poll which collected 20.36 million survey entries at www.worldairlinesurvey.com.
Virgin Atlantic dropped four places to 29th overall but remained the highest ranked United Kingdom airline. It is still some way off its 2006 heyday, when it topped the table, but the news is likely to offer something of a boost for the beleaguered company, which has faced criticism in recent years for scrapping free food and drink on short-haul flights, cutting legroom, and copying low-priced carriers with the introduction of "Basic" fares, which mean passengers with hold luggage pay more.
Over 100 customer nationalities participated in the survey with 20.36 million eligible entries counted in the results.
The carrier also took out the awards for best first class, best airline in Asia and best first class seat.More news: Boeing Gets $3.9B Contract for New Air Force One Jets
Best Business Class, Best Business Class Seat and Best First Class Lounge went to Qatar Airways.
Air Canada was named Best Airline in North America, while Air Transat was named Best Leisure Airline in the World.
WestJet was named Best Low-Cost Airline in North America. Aeroflot 7. EVA Air 8.
Qatar's Middle East rival, Emirates, was voted fourth. Deutsche Lufthansa was the only European airline to make it to the Top 10, while there were none from the US.More news: Brewers Josh Hader apologizes for offensive tweets that surfaced during All-Star game