that airline routes can change over time due to various factors, so it's a good idea to verify the information with up-to-date sources:
Perth to London - Approximately 9,010 miles (14,498 km)
Los Angeles to Singapore - Approximately 8,770 miles (14,115 km)
Delhi to San Francisco - Approximately 8,152 miles (13,127 km)
Sydney to San Francisco - Approximately 7,434 miles (11,945 km)
Singapore to Los Angeles - Approximately 7,621 miles (12,281 km)
these distances are approximate and can vary based on factors like flight paths, winds, and operational considerations.
Additionally, there may have been changes or new routes introduced since my last update. Always check with airlines or authoritative sources for the most current information on long-haul routes.