Excellent solution with Lufthansa to book very cheap return flights from main airports in France to Hong Kong including flights during summer holidays 2018! (Some of the routes might by operated by their Star Alliance partners Swiss or Austrian Airlines). Althought this is not best time to visit Hong Kong it is still considered as a peak season when cost of a ticket is considerably higher than for rest of the year. Return flights with one layover in Germany, Austria or Switzerland are now available already for €332 incl. all taxes and fees and checked bag! Look for flights from Bordeaux, Nantes, Toulouse, Nice, Marseille, Lyon or Paris..
5* Lufthansa promotion is valid for flights when departing from France to Hong Kong from 28th of April till 12th of December 2018 or 2nd of January to 27th of February 2019. As mentioned this is including quite rare chance to book budget flights from Europe to Hong Kong in July and August! Max stay 3 months. Discount is available till 27th of April but I suggest that this offer will be sold out before that.
Booking sample **Seems that there is no availability during summer holidays on this route
Booking sample of 5* Lufthansa cheap flights from France to Hong Kong from just €332 incl. summer holidays! Your outbound flight from Bordeaux to Hong Kong would be on 11th of November and you would return from China back to Europe on 24th of November 2018.