Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Mackay to Duesseldorf Intl Airport as you normally would.
For a flight from Mackay to Duesseldorf Intl, you will be flying from Mackay. Mackay (MKY) is just 3.3 km from the centre of the city. Mackay is the only Mackay airport and it handles 0 outbound flights to Duesseldorf Intl per day. 0 airlines have flights to Duesseldorf Intl from Mackay on a regular basis.
Yes, there are multiple flights from Mackay to Duesseldorf Intl Airport for under $2,300. The cheapest flight booked recently is on Multiple Airlines for just $2,246, but on average you can expect to pay $14,410.