Does Singapore Airlines have a 24 hour cancellation policy? Yes, Singapore Airlines offers a 24-hour cancellation policy. If you cancel your flight within 24 hours of booking, you can receive a full refund. To cancel, contact their customer service team at ☎ 1-866-884-3315✈️ (US) or ☎ 1-866-884-3315✈️ (UK). After this 24-hour window, cancellation fees may apply depending on the fare conditions. Their team is available around the clock to assist you with cancellations or any other queries.