The awards, which claims to identify passengers' favourite carriers around the globe, also ranked Southwest Airlines as the best carrier in the US and Virgin Atlantic the best major airline in Europe.
It states that all award winners were determined using an algorithm that took into account the quantity and quality of airline reviews and ratings submitted by travelers worldwide, over a 12-month period on TripAdvisor flights.
The awards also recognise the top airlines in four distinct service classes: International First Class, Business Class, Premium Economy and Economy.
The hallmarks of Travelers' Choice award winners are "outstanding service, quality and value", says TripAdvisor.
"We're thrilled to recognise the global TripAdvisor community's favourite airlines and shine a spotlight on the carriers around the world that provide the very best flying experiences," said Bryan Saltzburg, senior vice president and general manager for TripAdvisor Flights.
"As the airline industry introduces new fare products and a widening array of in-flight offerings, consumers continue to seek out the carriers that deliver value and a quality experience.
"The Travelers' Choice awards for airlines recognise the carriers that exceed passenger expectations and receive top marks from travelers."
Singapore Airlines' CEO, Goh Choon Phong, enthused: "Our business model is based around three main pillars – product leadership, service excellence and network connectivity.
"We are continuing to invest heavily in all three areas to ensure we have industry-leading offerings that meet and exceed our customers' expectations, both on the ground and in the air."
While Southwest's vice president and chief marketing officer, Ryan Green, notes: "It's an honour to receive several TripAdvisor Travelers' Choice awards for Airlines including being the only US-based carrier named a top ten airline in the world."