The US Department of Transportation has enacted a Singapore Airlines cancellation policy 24 hrs that prohibits carriers from charging cancellation fees. This is only possible when you cancel your flight within 24 hours of purchasing it. Singapore Airlines also adheres to this 24-hour cancellation policy. Hence, passengers of this airline can change their flights at the specified time without any cost. Furthermore, according to Singapore Airlines 24-hour cancellation policy, if you cancel it in time, you can also get your money back as a source of payment.