Air France – KLM Flying Blue last week launched a business and economy award sale to Hanoi from Europe (read more here) that is available from more destinations.
You can travel from eastern North America to Hanoi for 13,000 miles in economy or 55,000 in business.
You can access Flying Blue here.
Here are some searches I made:
Toronto – Hanoi BUSINESS
Montreal – Hanoi BUSINESS
New York – Hanoi BUSINESS
Chicago – Hanoi BUSINESS
Dallas – Hanoi BUSINESS
Miami – Hanoi BUSINESS
Washington Hanoi ECONOMY
These Flying Blue award prices in miles are very reasonable for the duration of this unannounced flash sale. I checked, and the flights from Central and South America weren’t discounted or available to Hanoi.