Update: Some offers mentioned below are no longer available. View the current offers here.Airfare deals are typically only available on limited dates. We recommend that you use Google Flights to find dates to fly, then book through an online travel agency, such as Orbitz, which allows you to cancel flights without penalty by 11pm Eastern Time within one day of booking. Remember: Fares may disappear quickly, so book right away and take advantage of Orbitz’s courtesy cancellation if you’re unable to travel.Flights from the US to Hong Kong can be some of the most expensive ultra long-haul routes in existence. Right now, however, many airlines are offering discounted flights from several US cities to Hong Kong (HKG). We’re seeing fares as low as $637 round-trip from Newark (EWR), Chicago (ORD) and San Francisco (SFO), valid for departures from September 2016 through May 2017 with some blackout dates.Airlines: SeveralRoute(s): US cities to Hong Kong (HKG)Cost: $637+ round-trip in economyDates: September 2016 - May 2017Booking Link: OrbitzPay With: American Express Premier Rewards Gold, Citi Prestige or Chase Sapphire PreferredHere are a few examples of what you can book:Newark (EWR) to Hong Kong (HKG) for $637 round-trip on Cathay Pacific in November:Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.Newark (EWR) to Hong Kong (HKG) for $637 round-trip on Cathay Pacific in November.Chicago (ORD) to Hong Kong (HKG) for $637 round-trip on United in September:Chicago (ORD) to Hong Kong (HKG) for $637 round-trip on United in September.San Fransisco (SFO) to Hong Kong (HKG) for $637 round-trip on United in November:San Fransisco (SFO) to Hong Kong (HKG) for $637 round-trip on United in November.Maximize Your PurchaseDon’t forget to use a credit card that earns additional points on airfare purchases, such as the American Express Premier Rewards Gold or Citi Prestige (3x on airfare) or the Chase Sapphire Preferred Card (2x on all travel purchases). Check out this post for more on maximizing airfare purchases.If you’re able to score one of these tickets, please share the good news in the comments below!