The flight time is approximately 5 hours, 31 minutes.
From Hanoi, Vietnam, flights to Singapore are 18½ hoursYou can see more here: Vietnam travel http://www.vietnamtraveltour.net
6hours and30minutes
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Air distance from Singapore to Darwin, Australia, totals 2,080 miles. That equals 3,348 kilometers or 1,808 nautical miles.
Air miles from Melbourne, Australia, to Singapore total 3,757 miles. That is 6,046 kilometers or 3,265 nautical miles.
Non-stop flights from the United States to Australia depart from either Los Angeles or San Francisco. Travel time is less from Los Angeles. The air travel time from Los Angeles to Melbourne is 15 hours 35 minutes. The travel time from Denver to Los Angeles depends on the airline you choose, but should add about 2 hours 15 -20 minutes to your air travel time.
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The flight time from Australia to Singapore is 5 hours and 31 minutes.
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It takes about 17 hours from NY to New Zealand, where you refuel. Then another 2 hours to Australia.
Flying time between Singapore and Malaysia----47 Mins
Distance from Frankfurt to Singapore: 5542 nautical miles. (Time and Date.com)