Cathay Pacific has round-trip flights from Dallas (DFW) to Hanoi or Kuala Lumpur (HAN, KUL) for $856-$950 with a connection. Hanoi flights in August. Kuala Lumpur flights between August and December. 7-day minimum stay required.
Some small OTAs on Skyscanner have this for as low as $804-$892; which is 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.