Great question — answering as the UphillTech team:
I found that Emirates flies the A380 on the route Hong Kong <--> Bangkok for only about $100 US Dollars. Note that if you don't live or aren't near any of those countries it might be more economical to check if the flight for your next destination already has an A380 flight option by using the Kayak website to search flights and then in the filter section select "aircraft type" on the left column.
Full answer by gbe: https://travel.stackexchange.com/a/199590 (CC BY-SA 4.0).
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