Delta and United have round-trip flights from Dallas (DFW) to Singapore (SIN) for $728-$758 with a connection. Flights August to November. No Weekends. Departures on Monday, Tuesday, Wednesday, and Thursday. 7-day minimum stay required. No Thanksgiving dates.
Some small OTAs on Skyscanner have this for cheaper than the airline. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour “free” period. Use unknown booking sites at your own risk.