There are several airlines that operate frequent flights from Denver (DEN) to Singapore (SIN) including

• United Airlines with 94 flights a week
• Delta Air Lines with 39 flights a week
• American Airlines with 24 flights a week
• Lufthansa Cargo with 17 flights a week
• Alaska Airlines with 11 flights a week

The earliest flight leaves Denver Intl. Airport at 05:45 and arrives at Changi Airport at 00:10. The last flight of the day departs Denver at 20:16 and arrives at Singapore at 23:15.

The flight distance from Denver to Singapore is about 16434 km, the shortest flight is 19 hours 59 minutes with United Airlines."

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