A friend of mine would have liked to come with his wife and child for 2-3 weeks at the beginning of July. A good flight connection Germany - Bangkok - Germany with a maximum of 1 stop and travel time under 18 hours would have cost around 6000 Euros for 3.
220000 Baht for the flighttickets only. He has now booked Greece instead.
It used to be easy to get last-minute flights (3 days flexible) to Bangkok (roundtrip) from Emirates, Thai, Lufthansa, KLM, Swiss, Finnair, etc. for around 800 Euros. For families with school-age children, flights in the european summer holidays to Thailand are simply too expensive. Beach holidays in Europe are by far cheaper at the moment.