Due to multiple factors, expect to potentially pay more when booking in September. For low rates, April can be a great choice for travel to Hamburg. Flights to Hamburg from Houston Hobby Airport in April are about $1,240 on average during April, but can be found for as low as $622.
It’s generally more expensive to depart on a Sunday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Houston Hobby Airport to Hamburg as you normally would.