Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Hong Kong to Dortmund as you normally would.
Hong Kong Intl
Dortmund
2 stops
23h 25mDortmund
Hong Kong Intl
2 stops
22h 45mMultiple Airlines
Hong Kong Intl
Dortmund
2 stops
20h 15mDortmund
Hong Kong Intl
3 stops
33h 00mMultiple Airlines
Hong Kong Intl
Dortmund
2 stops
27h 30mDortmund
Hong Kong Intl
2 stops
27h 15mLufthansa
Hong Kong Intl
Dortmund
2 stops
27h 30mDortmund
Hong Kong Intl
2 stops
27h 15mLufthansa
Hong Kong Intl
Dortmund
2 stops
27h 30mDortmund
Hong Kong Intl
1 stop
15h 20mLufthansa
Hong Kong Intl
Dortmund
2 stops
22h 05mMultiple Airlines
Yes, there are multiple flights from Hong Kong to Dortmund for under HK$14,100. The cheapest flight booked recently is on Multiple Airlines for just HK$14,013, but on average you can expect to pay HK$18,830.